AbstractFerri-fluoro-katophorite is the second species characterised involving the rootname katophorite in the sodium–calcium subgroup of the amphibole supergroup. The mineral and its name were approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification, IMA2015-096. It was found in the Bear Lake diggings, Bancroft area, Ontario, Canada, where coarse euhedral crystals of amphibole, phlogopite, sanidine solid-solution (now coarsely exsolved to microcline perthite), titanite, augite, zircon and fluorapatite crystallised from a low-viscosity silicocarbonatitic magma of crustal origin. Greenish grey prismatic crystals of ferri-fluoro-katophorite generally protrude from the walls into a body of coarsely crystalline calcite, but they also occur away from the walls, completely enclosed by calcite. The empirical formula derived from electron microprobe analysis and single-crystal structure refinement is: A(Na0.55K0.32)Σ0.87B(Na0.79Ca1.18Mn2+0.03)Σ2.00C(Mg3.29Mn2+0.02Fe2+1.19Fe3+0.31Al0.09Ti4+0.08Li0.02)Σ5.00T(Si7.39Al0.61)Σ8.00O22W[F1.23 (OH)0.77]Σ2.00. Ferri-fluoro-katophorite is biaxial (–), with α = 1.640(2), β = 1.652(2), γ = 1.658(2), 2Vmeas. = 68.9(2)° and 2Vcalc.. = 70.1°. The unit-cell parameters are a = 9.887(3), b = 18.023(9), c = 5.292(2) Å, β = 104.66(3)°, V = 912.3(6) Å3, Z = 2 and space group C2/m. The strongest ten lines in the powder X-ray pattern [d values (in Å) I (hkl)] are: 2.708, 100, (151); 2.388, 74, (131); 3.139, 72, (310); 8.449, 69, (110); 2.540, 65, ($\bar{2}$02); 2.591, 53, (061); 2.739, 47, ($\bar{3}$31); 2.165, 45, (261); 3.279, 44, ($\bar{2}$40); 2.341, 43, ($\bar{3}$51).

ABSTRACTFolvikite, Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4, is a new oxyborate mineral from the Kitteln mine, Värmland, Sweden, where it occurs as a primary skarn mineral embedded in calcite. It forms striated prismatic crystals up to 0.3 mm, and is black to dark reddish-brown with submetallic lustre and a reddish-brown streak. It is brittle, has a Mohs hardness of 6, and the calculated density is 4.14 g/cm3. Folvikite is biaxial with indeterminate optic sign due to pervasive twinning. The optic axial angle is 68.9(4)°. Refractive indices were not measured; the calculated mean refractive index is 1.85. Strong pleochroism was observed in plane-polarized light: AB = brown (intermediate), OB = dark brown (maximum) and ON = honey brown (minimum). Folvikite is monoclinic, space group P2, a = 5.3767(10), b = 6.2108(10), c = 10.9389(18) Å, β = 94.399(9)°, V = 364.22(16) Å3 and Z = 1. Chemical analysis by electron microprobe gave Sb2O5 18.15, MgO 24.11, MnO 29.73, Mn2O3 11.62, Al2O3 0.27, Fe2O3 0.45, B2O3 15.27, sum 99.60 wt.%. The B2O3 content was assigned as B = 4 apfu and the Mn2O3 / (MnO + Mn2O3) ratio was determined from the crystal structure. The empirical formula was normalized on the basis of 20 anions pfu: (Sb5+1.02Mn3+1.34Al0.05Fe3+0.05Mg5.46Mn2+3.82□0.26)Σ12O8(BO3)4. A simplified formula may be written as Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 with Z = 1. The crystal structure was solved by direct methods and refined to an R1 index of 4.1%. Folvikite is a member of the (3 Å) zigzag wallpaper-borate structures in which chains of edge-sharing octahedra extend along the c axis and are cross-linked by BO3 groups. There are five X sites partly occupied by Mn2+ > Mg, one octahedrally coordinated M-site occupied by Sb5+ > Mg, two M sites occupied by Mg ≥ Mn > Sb5+, two M sites occupied by Mn3+ > Mn2+, two M sites occupied by Mg > Mn2+, and one M-site occupied by Mg > □; plus two [3]-coordinated B sites occupied by B. As with the other zigzag borates, the polyhedra are arranged in F-walls, C-walls and S-columns.

ABSTRACTBeusite-(Ca), ideally Ca${\rm Mn}_{\rm 2}^{2 +} $(PO4)2, is a new graftonite-group mineral from the Yellowknife pegmatite field, Northwest Territories, Canada. It occurs in a beryl–columbite–phosphate rare-element pegmatite where it is commonly intergrown with triphylite–lithiophilite or sarcopside, and may form by exsolution from a high-temperature (Li,Ca)-rich graftonite-like parent phase. It occurs as pale-brown lamellae 0.1–1.5 mm wide in triphylite, and is pale brown with a vitreous lustre and a very pale-brown streak. It is brittle, has a Mohs hardness of 5, and the calculated density is 3.610 g/cm3. Beusite-(Ca) is colourless in plane-polarized light, and is biaxial (+) with α = 1.685(2), β = 1.688(2), γ = 1.700(5), and the optic axial angle is 46.0(5)°. It is non-pleochroic with X || b; Y ˄ a = 40.3° in β obtuse; Z ˄ a = 49.7° in β acute. Beusite-(Ca) is monoclinic, has space group P21/c, a = 8.799(2), b = 11.724(2), c = 6.170(1) Å, β = 99.23(3)°, V = 628.3(1) Å3 and Z = 4. Chemical analysis by electron microprobe gave P2O5 41.63, FeO 19.43, MnO 23.63, CaO 15.45, sum 100.14 wt.%. The empirical formula was normalized on the basis of 8 anions pfu: (Ca0.94Fe0.92Mn1.13)Σ2.99(PO4)2.00. The crystal structure was refined to an R1 index of 1.55%. Beusite-(Ca) is a member of the graftonite group with Ca completely ordered at the [8]-coordinated M(1) site.

Two new minerals of the graftonite group, graftonite-(Mn), ideally (MnFe2)-Mn-M(1)-Fe-M(2),M(3)(PO4)(2), and graftonite(Ca), ideally (CaFe2)-Ca-M(1)-Fe-M(2),M(3)(PO4)(2), were discovered in phosphate nodules of two beryl-columbite- phosphate pegmatites at Lutomia and Michalkowa, respectively, in the Gory Sowie Block, Lower Silesia. southwest Poland. Graftonite-(Mn) is pinkish brown, whereas graftonite-(Ca) shows more brownish colouration. Both minerals have a vitreous lustre, a good cleavage observed along (010) and irregular fracture; both are transparent and neither of them is fluorescent. They are brittle and have a Mobs hardness of similar to 5. The minerals are non-pleochroic, colourless in all orientations, biaxial (+), with mean refractive indices alpha = 1.710(2) and 1.690(2), beta= 1.713(2) and 1.692(2), and gamma = 1.725(2) and 1.710(5), respectively. With complete order of Ca at the M(1) site, the formulae of the holotype crystals are (M(1))(Mn0.70Ca0.30) (M(2),M(3))(Fe1.34Mn0.60Mg0.06Zn0.01)(Sigma 3)(PO4)(2) for graftonite-(Mn) and (M(1))(Ca0.98Mn0.02)(M(2),M(3))(Fe1.38Mn0.60Mg0.56)(Sigma 3)(PO4)(2) for graftonite-(Ca). Both crystal chemistry and crystal-structure refinement (R-1 =2.34 and 1.63%, respectively) indicate that the M(1) site is occupied dominantly by Mn in graftonite-(Mn) and by Ca in graftonite-(Ca), and the M(2) and M(3) sites are occupied by Fe2+ and Mn2+, with Fe2+ dominant over Mn2+ at the aggregate M(2) + M(3) sites. (iraftonite-(Mn) and graftonite-(Ca) are isostructural with graftonite, Fe-M(1)(M(2),M(3)) Fe-2(PO4)(2) (monoclinic system; space-group symmetry P2(1)/c), with the unit-cell parameters a = 8.811(2) angstrom(3), b = 11.494(2) angstrom, c = 6.138(1) angstrom, beta= 99.23 (3)degrees and V = 613.5(4) angstrom(3), and a = 8.792(2) angstrom, b= 11.743(2) angstrom, c = 6.169(1) angstrom, beta= 99.35(3)degrees and V= 628.5 (1) angstrom(3), respectively. The densities calculated on the basis of molar weights and unit-cell volumes are 3.793 g/cm(3) for graftonite-(Mn) and 3.592 g/cm(3) for graftonite-(Ca). The eight strongest lines in powder Xray diffraction patterns on the basis of single-crystal data are, respectively [d, angstrom, I (hkl)]: 2.874, 100, (230 + 040); 2.858, 79, (221); 3.506, 73, (130); 2.717, 79, (311); 2.952, 55, (131); 2.916, 53, (112); 2.899, 44, (300); 3.016, 35, (102); and 3.654, 100, (130); 2.979, 85, (221); 3.014, 77, (230); 3.042, 76, (040 + 112); 2.834, 68, (311); 3.097, 57, (131); 3.133, 56, (102); 2.542, 30, (311). Both minerals are common primary phosphates in phosphate nodules, occurring as lamellar intergrowths with sarcopside +/- tripbylite/lithiophilite, products of exsolution from a (Li,Ca)-rich graftonite-like parent phase crystallized at high temperature from P-bearing hydrosaline melts.

Abstract Brandãoite, [BeAl2(PO4)2(OH)2(H2O)4](H2O), is a new Be–Al phosphate mineral from the João Firmino mine, Pomarolli farm region, Divino das Laranjeiras County, Minas Gerais State, Brazil, where it occurs in an albite pocket with other secondary phosphates, including beryllonite, atencioite and zanazziite, in a granitic pegmatite. It occurs as colourless acicular crystals <10 µm wide and <100 µm long that form compact radiating spherical aggregates up to 1.0–1.5 mm across. It is colourless and transparent in single crystals and white in aggregates, has a white streak and a vitreous lustre, is brittle and has conchoidal fracture. Mohs hardness is 6, and the calculated density is 2.353 g/cm3. Brandãoite is biaxial (+), α = 1.544, β = 1.552 and γ = 1.568, all ± 0.002; 2Vobs = 69.7(10)° and 2Vcalc = 71.2°. No pleochroism was observed. Brandãoite is triclinic, space group P$\bar{1}$, a = 6.100(4), b = 8.616(4), c = 10.261(5) Å, α = 93.191(11), β = 95.120(11), γ = 96.863(11)°, V = 532.1(8) Å3 and Z = 2. Chemical analysis of a 4 µm wide needle-shaped crystal by electron microprobe and secondary-ion mass spectrometry gave P2O5 = 28.42, Al2O3 = 20.15, BeO = 4.85, H2O = 21.47 and sum = 74.89 wt.%. The empirical formula, normalised on the basis of 15 anions pfu with (OH) = 2 and (H2O) = 5 apfu (from the crystal structure) is Be0.98Al1.99P2.02H12O15. The crystal structure was solved by direct methods and refined to an R1 index of 7.0%. There are two P sites occupied by P5+, two Al sites occupied by octahedrally coordinated Al3+, and one Be site occupied by tetrahedrally coordinated Be2+. There are fifteen anions, two of which are (OH) groups and five of which are (H2O) groups. The simplified ideal formula is thus [BeAl2(PO4)2(OH)2(H2O)4](H2O) with Z = 2. Beryllium and P tetrahedra share corners to form a four-membered ring. Aluminium octahedra share a common vertex to form an [Al2φ11] dimer, and these dimers are cross-linked by P tetrahedra to form a complex slab of polyhedra parallel to (001). These slabs are cross-linked by BeO2(OH)(H2O) tetrahedra, with interstitial (H2O) groups in channels that extend along [100].

The chemical composition and chemical formula for ferro-ferri-nyboite given by Lussier et al . (2014) are wrong due to incorporation of errors during preparation of the paper. The data given in the original IMA submission are correct and are given here: SiO 2 47.06, TiO 2 0.50, Al 2 O 3 3.16, Fe 2 O 3 12.43, FeO 22.37, (Fe tot = 33.56), MnO 2.18, ZnO 0.06, MgO 0.23, CaO 1.03, Na 2 O 8.15, K 2 O 1.72, F 0.84, H 2 O calc 1.50, O ≡ F –0.35 sum 100.88 wt.%. The formula unit, calculated on the basis of 24 (O + OH + F) with (OH + F) = 2 apfu , is (Na 0.67 K 0.35 )(Na 1.83 Ca 0.17 )(Mg 0.05 Fe 2+ 2.96 Mn 0.29 Zn 0.01 Al 0.03 Fe 3+ 1.48 Ti 0.06 )(Si 7.44 Al 0.56 )O 22 (OH 1.58 F 0.42 ).

Pink-orange crystals of a composition within the ferri-obertiite compositional space were found in vesicles in a pale beige silicate vein found from a basalt quarry at Mount Rothenberg, Eifel district, Germany. Associated minerals are potassic feldspar, alpha quartz paramorphic after beta quartz, eifelite (the second occurrence after the Caspar quarry at Bellerberg volcano, Eifel region), tridymite, rutile, roedderite and other amphiboles. The ideal formula of ferri-obertiite is (NaNa2)-Na-A-Na-B (C)(Mg3Fe3+ Ti)(Si8O22O2)-Si-T-O-W; the empirical formula derived for the holotype specimen from Mount Rothenberg from the results of electron-microprobe analysis and single-crystal structure refinement is (A)(Na0.76K0.22)(Sigma 0.98) (B)(Na1.61Ca0.35Mn0.042+)(Sigma 2.00)(C)(Mg-3.58 Mn-0.11(2+) Fe-0.62(3+) Ti0.664+Cr0.013+Zn0.01Ni0.01)(Sigma 5.00) (T)(Si-7.82 Ti0.124+Al0.06)(Sigma 8.00)O-22 (W)[O1.26F0.55(OH)(0.19)](Sigma 2.00). The unit-cell dimensions are a = 9.7901(7), b = 17.9354(13), c = 5.2892(4)angstrom, beta = 104.142(2)degrees, V = 900.58 (11) angstrom(3). The space group is C2/m, Z = 2. Ferri-obertiite is biaxial (+), with alpha = 1.664, beta = 1.680, gamma = 1.722, all +/- 0.002 and 2V (meas.) = 66.4(3)degrees, 2V (calc.) = 64.7 degrees. The strongest eight reflections in the powder X-ray pattern [d values (in angstrom), I, (hkl)] are: 2.704, 100, (151); 3.116, 76, (310); 3.388, 72, (131); 8.931, 72, (110); 2.529, 67, ((2) over bar 02); 2.583, 39, (061); 2.160, 38, (261); 3.260, 37, (240). Both the mineral and the name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 2015-079); the rock specimen has been deposited at the Museo di Mineralogia, Dipartimento di Scienze della Terra e dell'Ambiente, Universita degli Studi di Pavia, under the code 2015-02.

Maruyamaite, ideally K(MgAl2)(Al5Mg)Si6O18(BO3)(3)(OH)(3)O, was recently approved as the first K-dominant mineral-species of the tourmaline supergroup. It occurs in ultrahigh-pressure quartzofeldspathic gneisses of the Kumdy-Kol area of the Kokchetav Massif, northern Kazakhstan. Maruyamaite contains inclusions of microdiamonds, and probably crystallized near the peak pressure conditions of UHP metamorphism in the stability field of diamond. Crystals occur as anhedral to euhedral grains up to 2 mm across, embedded in a matrix of anhedral quartz and K-feldspar. Maruyamaite is pale brown to brown with a white to very pale-brown streak and has a vitreous luster. It is brittle and has a Mohs hardness of similar to 7; it is non-fluorescent, has no observable cleavage or parting, and has a calculated density of 3.081 g/cm(3). In plane-polarized transmitted light, it is pleochroic, 0 = darkish brown, E = pale brown. Maruyamaite is uniaxial negative, w = 1.634, e = 1.652, both 0.002. It is rhombohedral, space group R3rii, a = 15.955(1), c = 7.227(1) angstrom, V= 1593(3) angstrom(3), Z= 3. The strongest 10 X-ray diffraction lines in the powder pattern are [d in A(1)(hkl)]: 2.581(100)(051), 2.974(85)(T32), 3.995 (69) (240), 4.237(59)(231), 2.046(54)(762), 3.498(42)(012), 1.923(36)(372), 6.415(23)(T11), 1.595(22) (5.10.0), 5.002(21)(021), and 4.610(20)(030). The crystal structure of maruyamaite was refined to an R, index of 1.58% using 1149 unique reflections measured with MoKa X-radiation. Analysis by a combination of electron microprobe and crystal-structure refinement gave Si02 36.37, A1203 31.50, TiO2 1.09, Cr2O3 0.04, Fe2O3 0.33, FeO 4.01, MgO 9.00, CaO 1.47, Na2O 0.60, K20 2.54, F 0.30, B2O3(calc) 10.58, H2O(calc) 2.96, sum 100.67 wt%. The formula unit, calculated on the basis of 31 anions pfu with B = 3, OH = 3.24 apfu (derived from the crystal structure) and the site populations assigned to reflect the mean interatomic distances, is (K3.53Na0.19Ca0.26H0.02)Dc=1.00(Mg(1.19)Fer(55)FerosTi(0.14) Al(1.0)7)2Y-3.00(Al5.00MgO)(S15.97A10.03018)(BO3)(3)(OH)(3)(OhoFo.160110,24). Maruyamaite, ideally K(MgAl2) (A15Mg)(BO3)3(Si6018)(OH)(3)O, is related to oxy-dravite: ideally Na(MgAl2)(Al5Mg)(BO3)3(S16018) (OH)(3)O, by the substitution xK-: xNa.

Ferro-ferri-hornblende is a new member of the amphibole supergroup (IMA-CNMNC 2015-054). It has been found in a rock specimen from the historical collection of Leandro De Magistris, which was collected at the Traversella mine (Val Chiusella, Ivrea, Piemonte, Italy). The specimen was catalogued as 'speziaite', and contains a wide range of amphibole compositions from tremolite/actinolite to magnesio-hastingsite. The end-member formula of ferro-ferri-hornblende is (A)square Ca-B(2)C(Fe42+Fe3+)T(Si7Al) O-22 W(OH)2, which requires SiO2 43.41, Al2O3 5.26, FeO 29.66, Fe2O3 8.24 CaO 11.57, H2O 1.86, total 100.00 wt.%. The empirical formula derived from electron microprobe analysis and single-crystal structure refinement for the holotype crystal is A(Na0.10K0.13)(Sigma=0.23) (B)(Ca1.93Na0.07)(Sigma=2.00) (C)(Mg1.16Fe3.212+Mn0.06Fe0.453+Al0.12Ti0.01)(Sigma=5.01) (T)(Si7.26Al0.74)(Sigma=8.00) O-22 (W)(OH1.89F0.01Cl0.10)(Sigma=2.00). Ferro-ferri-hornblende is biaxial (-), with alpha = 1.697(2), beta = 1.722(5), gamma = 1.726(5) and 2V (meas.) = 35.7(1.4)degrees, 2V (calc.) = 43.1 degrees. The unit-cell parameters are a = 9.9307(5), b = 18.2232(10), c = 5.3190(3) angstrom, beta = 104.857(1)degrees, V = 930.40 (9) angstrom(3), Z = 2, space group C2/m. The a: b: c ratio is 0.545: 1: 0.292. The strongest eight reflections in the powder X-ray pattern [ d values (in angstrom), I, (hkl)] are: 8.493, 100, (110); 2.728, 69, (151); 3.151, 47, (310); 2.555, 37, ((2) over bar 02); 2.615, 32, (061); 2.359, 28, ((3) over bar 51); 3.406, 26, (131); 2.180, 25, (261). Type material is deposited in the collections of the Museo di Mineralogia, Dipartimento di Scienze della Terra e dell'Ambiente, Universita di Pavia, under the catalogue number 2015-01. Sample M/U15285 from the historical collection of Luigi Colomba, presently at the Museo Regionale di Scienze Naturali di Torino, was also checked, and the presence of ferro-ferri-hornblende was confirmed.

Abstract Oxo-mangano-leakeite, a newly approved end-member of the amphibole supergroup (IMA-CNMNC 2015-035), has been found in a rock containing manganese silicate and oxide at the Hoskins Mine, a Mn deposit 3 km west of Grenfell, New South Wales. The end-member formula of oxo-mangani-leakeite is ANaBNa2C(Mn3+4Li)TSi8 O22WO2, which would require SiO2 53.15, Mn2O3 34.91, Li2O 1.66, Na2O 10.28, total 100.00 wt.%. The empirical formula derived for the sample of this work from electron and ion microprobe analysis using constraints resulting from single-crystal structure refinement is A(Na0.65K0.36)∑ = 1.01B(Na1.94Ca0.06)∑ = 2.00C(Mg1.60Zn0.01Mn3+2.32Fe3+0.44Al0.03Ti4+0.03 Li0.58)∑ = 5.01T(Si7.98Al0.02)∑ = 8.00O22W(O1.34OH0.66)∑ = 2.00. Oxo-mangano-leakeite is biaxial (-), with α= 1.681, β = 1.712, γ = 1.738, all ± 0.002, and 2V (meas.) = 81.0(4)°, 2V (calc.) = 83.5°. The unit-cell dimensions are a = 9.875(5), b = 17.873(9), c = 5.295(2) Å, β = 104.74(3)°, V = 903.8 (7) Å3; the space group is C2/m, with Z = 2. The strongest ten reflections in the powder X-ray pattern [d values (in Å), I, (hkl)] are: 8.423, 100, (110); 3.377, 46, (131); 4.461, 40, (040); 4.451, 40, (021); 3.134, 37, (310); 2.694, 37, (151); 2.282, 27, (3̅12); 2.734, 25, (3̅31); 2.575, 24, (061); 2.331, 24, [(3̅51) (4̅21)]. The holotype material is deposited in the Canadian Museum of Nature, Ottawa, under the catalogue number CMNMC 86895.

Magnesio-ferri-fluoro-hornblende has the ideal formula (A)square Ca-B(2)C(Mg4Fe3+)(T)(Si7Al)O-22 F-W(2) (Hawthorne et al., 2012). The holotype sample described in this work occurs as prismatic crystals in vugs of volcanic rocks (Seruci ignimbrites), found along the coast road similar to 5.5 km northeast of Portoscuso, Cagliari, Sardinia; associated minerals are tridymite, todorokite, magnetite, and hematite. The name and the mineral were approved by the IMA CNMNC (2014-091). Holotype magnesio-ferri-fluoro-hornblende is monoclinic, space group C2/m, a = 9.839(5), b = 18.078(9), c = 5.319(3) angstrom, beta = 104.99(3)degrees, V = 913.9(9) angstrom(3), Z = 2. The density calculated from the empirical formula is 3.315 g cm(-3). In plane-polarized light, magnesio-ferri-fluoro-hornblende is pleochroic, X = pale grey (least), Y = dark grey (most), Z = pale brownish grey (intermediate); X (boolean AND) a = 47.6 degrees (beta obtuse), Y // b, Z (boolean AND) c = 33.4 degrees (beta acute). It is biaxial negative, alpha = 1.669, beta = 1.676, gamma = 1.678, all +/- 0.002; 2V(obs) = 74(1)degrees, 2V(calc) = 56 degrees. The strongest eight lines in the powder X-ray diffraction pattern are [d in angstrom (I)(hkl)]: 2.711 (100)(151), 8.412 (89)(110), 3.121 (64)(310), 2.553 (61)((2) over bar 02), 3.389 (55)(131), 2.599 (45)(061), 2.164 (36)(261), and 2.738 (34)((3) over bar 31). Electron-microprobe analysis of the refined crystal gave SiO2 45.34, Al2O3 6.18, TiO2 1.22, FeO 15.24, Fe2O3 6.27, MgO 9.71, MnO 0.78, ZnO 0.06, CaO 10.18, Na2O 1.35, K2O 1.15, F 3.22, Cl 0.30, H(2)Ocalc 0.37, sum 99.95 wt.%. The empirical formula unit, calculated on the basis of 24 (O,OH,F,Cl) apfu with (OH + F + Cl) = 2 apfu is: (Na0.15K0.22)(Sigma 0.37)(Na0.25Ca1.66Mn0.09)(Sigma 2.00)(Mg2.20Fe1.942+ Mn0.01Zn0.01Fe0.723+ Ti-0.13)(Sigma 5.01) (Al1.11Si6.89)(Sigma 8.00)O-22[F-1.55(OH)(0.37)Cl-0.08)(Sigma 2.00).

Abstract Magnesio-arfvedsonite, the CFe3+-dominant analogue of eckermannite, has been found in a sample of “szechenyite” in the mineral collection of the American Museum of Natural History (AMNH H35024). It comes from the northern part of the Jade Mine Tract near Hpakan, Kachin State, Myanmar. Associated minerals are kosmochlor-jadeite solid-solution pyroxene and clinochlore. The ideal formula of magnesio-arfvedsonite is ANaBNa2C(Mg4Fe3+)TSi8O22W(OH)2, and the empirical formula derived from electron microprobe analysis and single-crystal structure refinement for the sample of this work is A(Na0.96K0.04)∑=1.00B(Na1.57Ca0.40Fe2+0.02Mn0.01)∑=2.00C(Mg4.26Fe2+0.19Fe3+0.41Al0.11Ti4+0.03)∑=5.00T(Si7.99Al0.01)∑=8.00O22W[F0.02(OH)1.98]∑=2.00. The unit-cell dimensions are a - 9.867(1), b = 17.928(2), c = 5.284(1) Å, β = 103.80(2)°, V = 907.7 (2) Å3, Z = 2. Magnesio-arfvedsonite is biaxial (-), with α = 1.624, β = 1.636, γ = 1.637, all ± 0.002 and 2Vobs = 36(1)°, 2Vcalc = 32°. The ten strongest reflections in the X-ray powder pattern [d values (in Å), I, (hkl)] are: 2.708, 100, (151); 3.399, 68, (131); 3.144, 63, (310); 2.526, 60, (2̄02); 8.451, 46, (110); 3.273, 39, (240); 2.167, 37, (261); 2.582, 34, (061); 2.970, 34, (221); 2.326, 33, [(2̄51) (4̄21)].

Katophorite has the ideal formula Na-A(B)(NaCa)(C)(Mg4Al)(T)(Si7Al)O-22(W)(OH)(2) (Hawthorne et al., 2012). No published analyses of amphiboles fall in the katophorite compositional field, except that of Harlow and Olds (1987) for an amphibole from near Hpakan in the Jade Mine Tract, Myanmar. This amphibole was approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification (vote 2013-140) as katophorite, and is reported here. Holotype katophorite is monoclinic, space group C2/m, a = 9.8573(8), b = 17.9617(15), c = 5.2833(4) angstrom, b = 104.707(2)degrees, V = 904.78(13) angstrom(3), Z = 2. The calculated density is 3.091 g cm(-3). In plane-polarized light, katophorite is pleochroic, X = pale blue (medium), Y = light blue-green (strongest), Z = colourless; X boolean AND a = 30.6 degrees (beta obtuse), Y parallel to b, Z boolean AND c = 15.8 (beta acute). It is biaxial negative, alpha = 1.638, beta = 1.642, gamma = 1.644, all +/- 0.002; 2V(obs) = 73(1)degrees, 2V(calc) = 70 degrees. The eight strongest lines in the powder X-ray diffraction pattern are [d in angstrom (I)(hkl)]: 2.700 (100)(151), 3.129 (69)(310), 2.536 (65)((2) over bar 02), 3.378 (61)(131), 8.421 (55)(110), 2.583 (46)(061), 2.942 (43)(221) and 2.334 (41)((3) over bar 51). Electron-microprobe analysis of the refined crystal gave SiO2 51.74, Al2O3 7.38, TiO2 0.14, FeO 1.55, Fe2O3 2.82, MgO 18.09, CaO 8.17, Na2O 6.02, K2O 0.24, F 0.06, H2Ocalc. 1.80, Li2Ocalc. 0.09, sum 100.55 wt.% (Li2O and H2O based on the results of single-crystal structure refinement). The formula unit, calculated on the basis of 24 (O,OH,F) with (OH + F + O) = 2 is: (A)(Na0.85K0.04)(Sigma=0.89)(B)(Ca1.22Na0.78)(Sigma=2.00)(C)(Mg3.76Al0.43Fe0.303+Cr0.273+Fe0.182+Li0.05Ti0.014+)(Sigma=5.00)(T)(Si7.21Al0.79)(Sigma=8.00)O-22(W)[(OH)(1.67)O0.30F0.03)](Sigma=2.00).

Following the characterization of the new amphibole species fluoro-leakeite, ideally Na-A Na-B(2) (C)(Mg2Al2Li) Si-T(8) O-22 F-W(2), at Nona Karr (Sweden), so far considered the type locality of eckermannite, re-examination of the holotype material of eckermannite deposited at the Museum of Natural History in London (BM 1949.151) and of the original sample analyzed by Tornebohm (1906) confirmed that they both are actually fluoro-leakeite. A survey of literature data showed that the only analysis reported for eckermannite is that of sample AMNH 108401 from the Jade Mine Tract, Myanmar. Complete characterization of that sample has led to the approval of a new holotype for eckermannite (IMA-CNMNC 2013-136), ideally Na-A Na-B(2) (C)(Mg4Al) Si-T(8) O-22 (W)(OH)(2), which is described in this work.Holotype eckermannite from Myanmar has the empirical unit formula (A)(Na-0.K-87(0.06))(Sigma=0.93) (B)(Na1.89Ca0.11)(Sigma=2.00) (C)(Mg3.87Fe0.092+Mn0.01Fe0.383+)(Sigma=4.97) Si-T(8.00) O-22 (W)(F0.03OH1.97)(Sigma=2.00). It is monoclinic, C2/m, with a = 9.8087(7), b = 17.8448(13), c = 5.2905(4) angstrom, beta = 103.660(1), V = 899.8(1) angstrom(3); Z = 2, D-calc = 3.02 g/cm(3). Optics: biaxial (-); alpha = 1.605, beta = 1.630, gamma = 1.634 all +/- 0.002 (lambda = 590 nm). The 10 strongest reflections in the X-ray powder pattern [d values (in angstrom), I, (hkl)] are: 2.702, 100, [((3) over bar 31) (151)]; 3.395, 59, (131); 3.128, 56, (310); 2.525, 56, ((2) over bar 02); 8.407, 42, (110); 2.574, 36, [(061) (002)]; 3.257, 34, (240); 2.161, 33, (261); 2.966, 33, (060); 4.460, 30, (040).The reason for the rarity of eckermannite compositions are examined and discussed based on considerations on the short-range order of A cations and W anions.

Pieczkaite, ideally Mn-5(PO4)(3)Cl, is a new apatite-supergroup mineral from Cross Lake, Manitoba, Canada. It occurs as small patches and narrow veins in large crystals of apatite and (Mn,Cl)-bearing apatite in phosphate pods in the quartz core of a granitic pegmatite. Veins of Mn-bearing apatite narrow to similar to 25 mu m where the Mn content becomes high enough to constitute pieczkaite. It is gray with a grayish-white streak, does not fluoresce under ultraviolet light, and has no observable cleavage or parting. Mohs hardness is 4-5, and pieczkaite is brittle with an irregular fracture. The calculated density is 3.783 g/cm(3). Optical properties were measured using a Bloss spindle stage at a wavelength of 590 nm (using a gel filter). Pieczkaite is uniaxial (-) with indices of refraction omega = 1.696, epsilon = 1.692, both +/- 0.002. Pieczkaite is hexagonal, space group P6(3)/m, a = 9.504(4), c = 6.347(3) angstrom, V = 496.5(1) angstrom(3), Z = 2, c:a = 1:0.6678. The six strongest lines in the X-ray powder diffraction pattern are as follows: d (angstrom), I, (hkl): 2.794, 100, ((2) over bar 31,(1) over bar 31); 2.744, 88, (030); 2.639, 34, ((1) over bar 22); 2.514, 25, (031, 022); 1.853, 25, ((3) over bar 42, (1) over bar 42); 3.174, 24, (002). Chemical analysis by electron microprobe gave P2O5 37.52, MnO 41.77, FeO 2.45, CaO 13.78, Cl 3.86, H2O 0.60, O Cl 0.87, sum 99.11 wt% where the H2O content was calculated as 1-Cl apfu. The resulting empirical formula on the basis of 12 O anions is (Mn3.36Fe0.20Ca3.40)Sigma 4.96 (P1.01O4)(3)(Cl0.62OH0.38)(1.00), and the end-member formula is Mn-5(PO4)(3)Cl. The crystal structure of pieczkaite was refined to an R-1 index of 4.07% based on 308 observed reflections collected on a three-circle rotating-anode diffractometer with MoKa X-radiation. Pieczkaite is iso-structural with apatite, Mn is the dominant cation at both the [9]- and [7]-coordinated-cation sites in the structure, and Cl is the dominant monovalent anion.

Fontarnauite was discovered in cores recovered from the Kutahya-Emet 2 and 188 (named here as Doganlar) boreholes drilled in the Emet borate basin near the village of Doganlar, Kutahya Province, Western Anatolia, Turkey. The Emet (or Emet- Hisarcik) basin is one of the Neogene basins in western Turkey bearing a borate-rich unit intercalated with Miocene sediments. Fontarnauite is most commonly associated with probertite, glauberite, and celestine and occurs as isolated colorless to light-brown prismatic crystals or as clusters of crystals less than 5 mm long. Fontarnauite is brittle, with a Mohs hardness of 2½–3, and perfect {010} cleavage. D calc = 2.533 g/cm3. The new mineral is optically biaxial (−), α 1.517(2), β 1.539(2), γ 1.543(2) (590 nm); 2 V meas = 46(1)o; 2 V calc = 46o; X ^ a 95.0° (β obtuse); Y // b , Z ^ c 81.9° (β acute). Dispersion is r > v , medium to weak. The chemical composition (electron microprobe; B and H from the crystal-structure refinement) is as follows: SO3 17.75, B2O3 38.66, CaO 2.26, SrO 18.98, Na2O 12.65, K2O 1.70, H2O 10.01, total 102.01 wt.%. The empirical formula (based on 15 O atoms per formula unit) is (Na1.84K0.16)Σ2.00(Sr0.82Ca0.18)Σ1.00S1.00B5H5O15; the endmember formula is Na2Sr(SO4)[B5O8(OH)](H2O)2 based on the crystal-structure refinement. Single-crystal X-ray studies gave the space group P 21/c, a 6.458(2), b 22.299(7), c 8.571(2) A, β 103.047(13)o, V 1202.5(1.0) A3, Z = 4. Structure refinement ( R 1 = 2.9%) revealed that two BO4 tetrahedra and three BO3 triangles share vertices to form B5O10(OH) units that link to other B5O10(OH) units along [100] and [001] to give a [B5O8(OH)] sheet parallel to (010). Within the central cavities of opposing sheets are the H2O groups, SO4 tetrahedra, and Na (1) sites; the Sr and Na (2) sites occupy the interstices of a given sheet. The region of the structure where opposing cusps of neighboring sheets approach each other is dominated by weaker H-bonding associated with the OH and H2O groups, in accord with the observed perfect {010} cleavage. The strongest lines in the powder X-ray diffraction pattern, obtained after profile fitting using the Le Bail method, are as follows [ d in A ( I ) ( hkl )]: 11.1498 (100)(020), 3.3948 (8)(061), 3.3389 (20)(042), 3.1993, 3.1990 (10)(160, ![Formula][1] 42), 3.0458(10)(052), 3.0250(7)(220), 2.7500 (10)(![Formula][2] 22,142), 2.3999 (8)(260), 2.2300, 2.2284(7)(0 10 0, 222), 1.9241, 1.9237(7)(311,![Formula][3] 24). The holotype is deposited in the mineralogy collection of the Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada, accession number [M56745][4]. [1]: /embed/mml-math-1.gif [2]: /embed/mml-math-2.gif [3]: /embed/mml-math-3.gif [4]: /lookup/external-ref?link_type=GEN&access_num=M56745&atom=%2Fcanmin%2Fearly%2F2016%2F02%2F23%2Fcanmin.1400088.atom

The crystal structure of cayalsite-(Y), with idealized composition CaY6Al2Si4O18F6, has been determined on the basis of singlecrystal X-ray diffraction data. The mineral occurs in several polytypic modifications arising from the combination of three non-equivalent structural layers. Two maximum degree of order (MDO) polytypes have been identified in cayalsite-(Y). The orthorhombic MDO polytype, cayalsite-(Y)-1O, has lattice parameters a = 15.993(1), b = 5.5306(3) and c = 9.6590(7) A. It is described in space group symmetry Pban and refines to R-obs = 2.2%. The monoclinic MDO polytype, cayalsite-(Y)-1M, a = 11.0602(7), b = 5.5280(2), c = 16.0195(9) angstrom, beta = 118.925(3)degrees is described in space group symmetry P2/c and refines to R-obs = 3.5% in a two-phase mixture with cayalsite-(Y)-1O. Predominantly heavy lanthanide elements substitute for Y and Ca in cayalsite-(Y), with some Ca also substituting for the rare-earth elements (REE). A typical empirical composition, normalized to 24 anions, is Ca-1.03(Y4.73Nd0.02Gd0.34Dy0.43Er0.31Yb0.22)(Sigma 6.05)Al1.87Si4.03(F6.08O17.92)(Sigma 24). Cayalsite-(Y) forms colourless to faintly pink, prismatic crystals in cavities of yttrian fluorite in two granitic pegmatites located in Tysfjord, Nordland, Norway. Cayalsite-(Y)-1O crystals are optically biaxial (+), with indices of refraction alpha = 1.730(5), beta = 1.740(5), gamma = 1.760(5) and 2V(meas) = 56.5(5). The crystal structure of cayalsite-(Y) is composed of linear chains of edge sharing [AlO6] octahedra with isolated [SiO4] tetrahedra. The REE and Ca-cations occur in eight-fold coordination by O and F anions. Apart from substitutional disorder of REE and Ca atoms, the cayalsite structure is characterized by substitutional and positional disorder affecting the local position of [SiO4] tetrahedra in one of its layers. Avoidance of close Si-F contacts causes the partial splitting of O and F positions. The possible interplay of layer stacking and cation ordering is discussed.

Vladykinite, ideally Na3Sr4(Fe2+Fe3+)Si8O24, is a new complex sheet silicate occurring as abundant prismatic crystals in a dike of coarse-grained peralkaline feldspathoid syenite in the north-central part of the Murun complex in eastern Siberia, Russia (Lat. 58 degrees 22 ' 48 '' N; Long. 119 degrees 03 ' 44 '' E). The new mineral is an early magmatic phase associated with aegirine, potassium feldspar, eudialyte, lamprophyllite, and nepheline; strontianite (as pseudomorphs after vladykinite) and K-rich vishnevite are found in the same assemblage, but represent products of late hydrothermal reworking. Vladykinite is brittle, has a Mohs hardness of 5, and distinct cleavage on {100}. In thin section, it is colorless, biaxial negative [alpha = 1.624(2), beta = 1.652(2), gamma = 1.657(2), 2V(meas) = 44(1)degrees, 2V(calc) = 45(1)degrees] and shows an optic orientation consistent with its structural characteristics (X<^>a = 5.1 degrees in beta obtuse, Z<^>c = 4.7 degrees in beta acute, Y = b). The Raman spectrum of vladykinite consists of the following vibration modes (listed in order of decreasing intensity): 401, 203, 465, 991, 968, 915, 348, 167, 129, 264, 1039, and 681 cm(-1); O-H signals were not detected. The Mossbauer spectrum indicates that both Fe2+ and Fe3+ are present in the mineral (Fe3+/Fe-Sigma = 0.47), and that both cations occur in a tetrahedral coordination. The mean chemical composition of vladykinite (acquired by wavelength-dispersive X-ray spectrometry and laser-ablation inductively-coupled-plasma mass-spectrometry), with Fe-Sigma recast into Fe2+ and Fe3+ in accord with the Mossbauer data, gives the following empirical formula calculated to 24 O atoms: (Na2.45Ca0.56)(Sigma 3.01)(Sr-3.81 1(K0.04Ba0.02La0.02Ce0.01)Sigma(3.90)(Fe0.752+Fe0.663+Mn0.26Zn0.26Al0.12Mg0.05Ti0.01)(Sigma 2.01)(Si7.81Al0.19)(Sigma 8.00)O-24. The mineral is monoclinic, space group P2(1)/c, a = 5.21381(13), b = 7.9143(2), c = 26.0888(7) angstrom, beta = 90.3556(7)degrees, V = 1076.50(5) angstrom(3), Z = 2. The ten strongest lines in the powder X-ray diffraction pattern are [d(obs) in angstrom (I) (hkl)]: 2.957 (100) ((1) over bar 23, 123); 2.826 (100) ((1) over bar 17, 117); 3.612 (58) ((1) over bar 14, 114); 3.146 (37) (120); 2.470 (32) (210, 01.10); 4.290 (30) ((1) over bar 11, 111); 3.339 (30) ((1) over tilde 06, 115, 106); 2.604 (28) (200); 2.437 (25) (034); 1.785 (25) (21.10, 234). The structure of vladykinite, refined by single-crystal techniques on the basis of 3032 reflections with F-o > 4 sigma F-o to R-1 = 1.6%, consists of tetrahedral sheets parallel to (100) and consisting of (Si8O24)(16-) units incorporating four-membered silicate rings and joined into five- and eight-membered rings by sharing vertices with larger tetrahedra hosting Fe2+, Fe3+, Mn, Zn, Al, Mg, and Ti. Larger cations (predominantly Na, Sr, and Ca) are accommodated in octahedral and square-antiprismatic interlayer sites sandwiched between the tetrahedral sheets.Structural relations between vladykinite and other sheet silicates incorporating four-, five-, and eight-membered rings are discussed. The name vladykinite is in honor of Nikolay V. Vladykin (Vinogradov Institute of Geochemistry, Russia), in recognition of his contribution to the study of alkaline rocks. Holotype and co-type specimens of the mineral were deposited in the Robert B. Ferguson Museum of Mineralogy in Winnipeg, Canada.

Ferro-ferri-nyboite, NaNa2(Fe32+Fe23+)Si8O22(OH)(2), is a new mineral of the amphibole group from Poudrette quarry, Mont Saint-Hilaire, La Vallee-du-Richelieu RCM, Monteregie (formerly Rouville County), Quebec, Canada. It occurs in an igneous microbreccia associated with a eudialyte-group mineral, an astrophyllite-group mineral, albite, and nepheline. Crystals are prismatic parallel to [001] with {100} and {110} forms and cleavage surfaces, and the prism direction is terminated by irregular fractures. Grains are up to 3 cm long, and occur as blocky aggregates. Crystals are black with a greyish-green to black streak. Ferro-ferri-nyboite is brittle, has a Mohs hardness of 6 and a splintery fracture; it is non-fluorescent with perfect {110} cleavage, no observable parting, and has a calculated density of 3.424 g/cm(3). Crystals show extreme optical absorption due to intervalence charge transfer, which inhibited measurement of optical properties.Ferro-ferri-nyboite is monoclinic, space group C2/m, a 9.9190(5), b 18.0885(8), c 5.3440(3) angstrom, beta 103.813(1)degrees, V 931.09 (13) angstrom(3), Z = 2. The strongest ten X-ray diffraction lines in the powder pattern are [d in angstrom(I)(hkl)]: 8.520(100)(110), 3.162 (55)(310), 2.834(24)(330), 1.671(19)(461), 2.732(10)(151), 2.552(10)((2) over bar 02), 2.344(9)((3) over bar 51), 3.298(7)(240), 2.606(6)(061), 1.446(6)((6) over bar 61,4.10.0). Analysis by a combination of electron microprobe and Mossbauer spectroscopy gives SiO2 45.80, Al2O3 3.11, TiO2 0.50, Fe2O3 11.18, FeO 23.45, MnO 2.28, ZnO 0.12, MgO 0.23, CaO 0.99, Na2O 8.01, K2O 1.30, F 0.81, H2Ocalc 1.47, O = F-0.34 sum 98.91 wt.%. The formula unit, calculated on the basis of 24 (O + OH + F) with (OH + F) = 2 apfu is (Na0.68K0.27)(Sigma 0.95)(Na1.83Ca0.17)(Sigma 2.00)(Mg0.06Fe3.172+Mn0.31Zn0.01Fe1.363+Ti0.06)(Sigma 4.97)(Si7.41Al0.59)(Sigma 8.00)O-22(OH1.58F0.42)(Sigma 2.00). Ferro-ferri-nyboite, ideally NaNa2(Fe32+Fe23+) Si8O22(OH)(2), is related to endmember nyboite, NaNa2(Mg3Al2)Si8O22(OH)(2) by the substitutions Fe2+. -> Mg and Fe3+ -> Al.

Agakhanovite-(Y), ideally (YCa)square 2KBe3Si12O30, is a new milarite-group mineral from the Heftetjern pegmatite, Tordal, southern Norway. Crystals are prismatic along [001], and show the forms {100} and {100}. Agakhanovite-(Y) is colorless with a white streak and a vitreous luster, and does not fluoresce under ultraviolet light. There is no cleavage or parting, and no twinning was observed. Mohs hardness is 6, and agakhanovite-(Y) is brittle with a conchoidal fracture. The calculated density is 2.672 g/cm(3). Optical properties were measured with the Bloss spindle stage for the wavelength 590 nm using a gel filter. Agakhanovite-(Y) is uniaxial (-) with indices of refraction omega = 1.567, epsilon = 1.564, both +/- 0.002; the calculated birefringence is 0.003 and it is non-pleochroic. Agakhanovite-(Y) is hexagonal, space group P6/mcc, a = 10.3476(2), c = 13.7610(3) angstrom, V = 1276.02(9) angstrom(3), Z = 2, c:a = 1.330. The seven strongest lines in the X-ray powder-diffraction pattern are as follows: d (angstrom), I, (hkl): 2.865, 100, ((1) over bar 24); 3.287, 96, ((1) over bar 31); 4.134, 84, ((1) over bar 22); 6.877, 56, (002); 2.986, 43, (030); 4.479, 38, (020); 2.728, 36, (024). Chemical analysis by electron microprobe gave SiO2 69.56, Al2O3 0.35, Y2O3 9.69, Yb2O3 0.15, FeO 0.02 CaO 5.75, Na2O 0.07, K2O 4.52, BeO(calc) 7.06, H2O(calc) 1.74, sum 98.91 wt%. The H2O content was determined by crystal-structure analysis. On the basis of 30 anions, the empirical formula is (Y0.89Yb0.01 Ca-1.06)(Sigma 1.96)(H2O)(0.92)Na0.02K1.00(Be2.93Al0.07)(Sigma 3.00)Si12.02O30. The crystal structure of agakhanovite-(Y) was refined to an RI index of 1.9% based on 660 unique observed reflections collected on a three-circle rotating-anode (MoK alpha X-radiation) diffractometer equipped with multilayer optics and an APEX-II detector. In the end-member structure of agakhanovite-(Y), the A site is occupied equally by Y and Ca, and the B site is vacant; agakhanovite-(Y) is the Y-analog of oftedalite: ScCa square 2KBe3Si12O30, and the Y-Ca-Be analog of klochite, (Fe2+Fe3+)square 2KZn3Si12O30.