The mineral name "maufite" was proposed in 1930 to describe a "bright emerald green" nickeliferous vein material occurring within a serpentinite of the Great Dyke in the Umvukwe Range of Zimbabwe, then Southern Rhodesia. Study of this material shows that it is not a distinct species but rather an interstratified nickel-bearing lizardite-clinochlore, with lizardite dominant over clinochlore. The name "maufite" is discredited. The lizardite is a Group-A polytype, and the clinochlore is a Ia polytype in the nomenclature developed by S.W. Bailey. The formula calculated on the basis of 14 negative charges is (Mg1.74Al0.88Ni0.13 square(0.25))(Sigma 3.00)(Si1.60Al0.40)(Sigma 2.00)O-5(OH)(4); on the basis of nine oxygen atoms including 14.6 wt.% H2O determined thermogravimetrically, the formula is (Mg1.68Al0.78Ni0.13 square(0.41))(Sigma 3.00)(Si1.55Al0.45)(Sigma 2.00)O-4.51(OH)(4.49). Analytical electron microscopy shows that the composition is variable on a fine scale. The randomly interstratified lizardite-clinochlore occurs as a pseudomorph after amphibole and plagioclase and is a product of serpentinization. The material is poorly crystalline and very fine grained, producing broad reflections on powder diffraction and microbeam X-ray diffraction patterns. Unlike most of the interstratified serpentine-chlorite described in the literature, lizardite is here dominant over clinochlore.

Wopmayite, ideally Ca 6 Na 3 □Mn(PO 4 ) 3 (PO 3 OH) 4 , is a new secondary mineral from the Tanco mine, Bernic Lake, Manitoba. It occurs in vugs in a single 5–10 cm mass of phosphate-carbonate mineralization in a spodumene-rich boulder found in the dumps of the Tanco Mine, Bernic Lake, Manitoba, Canada. It is a secondary mineral that crystallized together with rhodochrosite, quartz, whitlockite, apatite, and other phases after dissolution of primary lithiophosphate by hydrothermal solutions. The initial crystal of wopmayite was a corroded {1011} rhomb ∼150 microns across. Wopmayite is colorless to white to pale pink with a white streak and a vitreous luster, and does not fluoresce under ultraviolet light. It has a Mohs hardness of 5, is brittle, has an irregular to subconchoidal fracture, and shows no cleavage or parting. The calculated density is 3.027 g/cm 3 . It is uniaxial (-), ω = 1.617, ɛ = 1.613, both ± 0.002. Wopmayite is hexagonal-rhombohedral, space group R 3 c , a 10.3926(2), c 37.1694(9) A, V 3476.7(2) A 3 , Z = 6, a:c = 1:3.577. The seven strongest lines in the X-ray powder-diffraction pattern are as follows: d (A), I , ( h k l ): 2.858, 100, (02.10); 3.186, 88, (234); 2.589, 68, (240); 5.166, 33, (120); 6.421, 32, (114); 8.017, 31, (012); and 3.425, 29, (1110). Chemical analysis by electron microprobe gave P 2 O 5 46.40, Al 2 O 3 0.38, Fe 2 O 3 0.80, FeO 0.96, MnO 3.74, MgO 0.41, CaO 37.65, SrO 0.91, Na 2 O 5.43, and H 2 O(calc) 2.00, sum 98.68 wt.%. The H 2 O content was determined by crystal-structure analysis. On the basis of 28 O apfu , the empirical formula is (Ca 7 .19 Na 1.88 Sr 0.09 ) Σ9.16 (Mn 0.56 Mg 0.11 Fe 2+ 0.14 Fe 3+ 0.11 Al 0.08 ) Σ1.00 (PO 4 ) 4.63 (PO 3 OH) 2.37 , and the endmember formula is Ca 6 Na 3 □Mn(PO 4 ) 3 (PO 3 OH) 4 . The crystal structure of wopmayite was solved by direct methods and refined to an R 1 index of 2.21% based on 2288 unique observed reflections collected on a three-circle rotating-anode ( M o K α X-radiation) diffractometer equipped with multilayer optics and an APEX-II detector. Wopmayite has a structural unit consisting of an [M 2+ (PO 4 ) 6 ] arrangement that is topologically the same as the structural units in the whitlockite and merrillite structures. The [M 2+ (PO 4 ) 6 ] clusters are linked by Ca polyhedra and (PO 3 Φ) groups of the form {Ca 9 X (PO 3 Φ)} where Φ = O,OH and X = (□, Na, Ca), depending on the mineral species. Wopmayite is related to whitlockite by the substitution Na + H → Ca + □, whereby Na is incorporated primarily at the Ca (3) site and H attaches to the P (1) tetrahedron to produce an acid-phosphate group. Thus merrillite contains no acid-phosphate group, whitlockite contains a single acid-phosphate group at P (3), and wopmayite contains acid-phosphate groups at both P (1) and P (3).

Groatite, ideally Na Ca Mn-2(2+) (PO4) [PO3(OH)](2), is a new mineral species from the Tanco pegmatite at Bernic Lake, Manitoba, Canada. It was found in a phosphate-carbonate mass in a spodumene-rich boulder. Groatite occurs sparingly as slightly divergent sprays of acicular crystals, embedded stellate sprays and as a tabular mass of densely intergrown acicular crystals. Groatite is closely associated with whitlockite, crandallite, an unidentified Na-Al phosphate and quartz; fairfieldite and manganese-rich overite are among the less closely associated phosphates; this assemblage may be secondary, following apparent dissolution of lithiophosphate and possibly of primary lithiophilite. Groatite is translucent, colorless to pale yellow and pale orange with a white streak and vitreous luster; it does not fluoresce under ultraviolet light. The Mohs hardness is 3. Groatite is brittle with an uneven fracture, and has a calculated density of 3.213 g/cm(3). It is biaxial positive with alpha 1.622, beta 1.634, gamma 1.663 (all +/-0.001), and is nonpleochroic; 2V(obs.) = 67(1), 2V(calc.) = 66.5 degrees. It is monoclinic, space group C2/c, a 12.5435(9), b 12.4324(9), c 6.7121(4) angstrom, beta 115.332(2)degrees, V 946.07(19) angstrom(3), Z = 4. The six strongest lines in the X-ray powder-diffraction pattern [d in angstrom(I)(hkl)] are as follows: 3.187(100)((1) over bar 12), 2.726(90)((4) over bar 02, 240), 6.204(80)(020), 2.788(80)(330), 5.653(70)(200), and 2.580(70)((1) over bar 32, 420). Chemical analysis by electron microprobe gave P2O5 46.66, FeO 0.49, MnO 29.31, CaO 12.51, Na2O 6.87, H2O (calc.) 3.93, sum 99.77 wt.%, where the H2O content was determined by crystal-structure refinement as OH = 2.0 apfu. The resulting empirical formula, on the basis of 10 O atoms and 2 (OH) groups pfu, is Na-1.02 Ca-1.02 (Mn1.90Fe0.032+)(Sigma 1.93) P-3.02 O-10 (OH)(2). The crystal structure of groatite was refined to an R index of 2.7% based on 831 unique reflections collected on a four-circle diffractometer with MoK alpha X-radiation and a 4K CCD detector. There are two tetrahedrally coordinated T-sites occupied by P. There are two octahedra, M(1) and M(2), and an eight-coordinated A(2) site which are occupied by Ca, Mn and Na, respectively. The observed site-scattering, mean bond-lengths and bond-valence sums at these sites are in agreement with complete chemical order of Ca at M(1), Mn2+ at M(2) and Na at A(2). A (PO4) group is centered at the T(1) site and a PO3(OH) group at T(2). The H atom is located near the O(4) anion and provides a strong hydrogen bond to the O(2) anion. Groatite is isostructural with the acid arsenate mineral o'danielite and is a member of the alluaudite group; it is the first alluaudite-group mineral with an acid phosphate group. The new mineral is named in honor of Lee A. Groat, Professor of Mineralogy at the University of British Columbia in Vancouver. The species and the name groatite were approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 2008-054).

Nous avons affine la structure cristalline d'un silicate de Sn 2+ anthropogenique, Sn 6 O 4 (SiO 4 ). hexagonal, groupe d'espace P6 3 mc, a 7.3742(4), c 11.9598(10) A, V 563.23(6) A 3 , Z = 2, D calc 5.12 g/cm 3 , et un sulfate de Sn 2+ anthropogenique, Sn 6 O 4 (SO 4 )(OH) 2 , orthorhombique, groupe d'espace Pbca, a 14.0071(8), b 12.5016(7), c 14.5030(9) A, V 2539.6(3) A 3 , Z = 8, D calc 4.74 g/cm 3 , par techniques de moindres carres sur matrice entiere en utilisant les facteurs F 2 ,jusqu'a un residu R1 (silicate et sulfate) de 3.0 et 4.2% calcule pour 704 et 3281 reflexions uniques observees (IFol ≥ 4 σF ), et une valeur de J+.R 2 egale a 5.5 et 11.0% pour toutes les donnees, respectivement. Les donnees d'intensite ont ete prelevees a temperature ambiante avec rayonnement MoKa et un detecteur a aire de type CCD. Les deux structures contiennent des groupes [Sn 6 φ 8 ], φ correspondant a O 2- ou (OH) - , derives de la structure de la fluorite, tout comme dans plusieurs composes d'etain bivalent. On trouve ces deux composes associes a la romarchite, SnO, et la hydroromarchite, Sn 3 O 2 (OH) 2 , sur des bols en alliage d'etain devenus corrodes suite a leur submersion dans l'eau fraiche froide pour environ 160 ans.

Rouvilleite, ideally Na3Ca2(CO3)3F, is a new mineral species from Mont Saint-Hilaire, Quebec. The mineral is transparent to translucent and occurs as tan, rusty brown and colorless crystalline masses, and rarely as transparent euhedral crystals, in an inclusion of sodalite syenite in nepheline syenite. Crystals are prismatic, elongate along [001], and are either terminated by {001} or by {101}, {023} and {032BAR}. Associate minerals include villiaumite, shortite, aegirine, microcline, cancrinite, analcime, vuonnemite, cryolite, kogarkoite and others. Rouvilleite is brittle, Mohs hardness about 3, with a vitreous to slightly waxy luster, a white streak, an uneven fracture and imperfect {010} and good {001} cleavages. The mineral effervesces vigorously in 1:1 HCl and does not show fluorescence in ultraviolet light. It is optically biaxial negative with alpha 1.472(1), beta 1.562(1), gamma 1.569(1), 2V(meas)25(1)degrees, 2V(calc)30-degrees, and a weak dispersion r > nu. The orientation is b = Y, c LAMBDA X = 6-degrees in the acute beta angle. Rouvilleite is monoclinic, Cc or C2/c, with a 8.043(4), b 15.812(5), c 7.030(3) angstrom, beta 101.16(3)degrees, V 877.1(4) angstrom-3 and Z = 4. The strongest six lines of the X-ray-diffraction pattern (Gandolfi) [d in angstrom (I)(hkl)] are: 7.081(80)(110), 2.937(70)(150), 2.895(100)(202BAR), 2.711(90)(222BAR), 2.039(70)(242) and 1.869(75)(352BAR). Averaged results of electron-microprobe analyses give Na2O 25.95, CaO 26.47, MnO 6.83, FeO 0.52, MgO 0.01, F 5.65, CO2(calc.) [37.21], -F = 2.38, sum 100.26 wt.%, corresponding to Na2.97(Ca1.67Mn0.34Fe0.02)SIGMA-2.03(CO3)3F1.06. Infrared-absorption spectroscopy confirms the presence of CO2. D(meas.) 2.67(2), D(calc.) 2.69 g/cm3. The name recalls Rouville County, within which Mont Saint-Hilaire occurs.

A hydrous aluminum oxide containing about 7 wt.9o F is widely distributed in small amounts at the Francon quarry, Montreal, Quebec. Chemical analyses have given variable results, but the formula of the mineral is interpreted to be AI(OH,F)3. The F is concluded to be incorporated structurally, whereas excess water and persistently present Si, in amounts up to several wt.qo, are attributd to absorp- tion and admixture with amorphous silica. The fluorine- bearing mineral occurs mainly as white powdery coatings and coalesced globules, The globules are typically 0.1 to 0.2 mm in diameter and consist of fine-grained aggregates in a radial pattern. Individual grains are colorless and have a parallel or almost parallel extinction, with Z' parallel to the elongation and rx' 1.535(5), nz' 1.550(5). The X-ray powder pattern, indexed by.analogy to gibbsite, has its stronsest five lines ld in A(I)(hkt)l at 4.83(10'0)(002), 4.340(60X200, 1 l0), 2.420(30X004,O2l), 2.00,6Q0\Qt3,40.2) and 1.446(30X133,6N,423). TGA curves are similax to those of gibbsite, but the IR spectrum is simpler than that of other A1(OH)3 minerals.

Whiteite-(CaMnMg), a new mineral species found in a granitic pegmatite in the Tip Top mine, near Custer, Soutl Dakota, occurs as dull or etched, yellowish bipyramidal crystals or blebs up to 1.5x0.5x0.5 mm. It occurs as a secondary mineral on massive beryl associated with monr- gomeryite, tiptopite, roscherite and englishite. The mineral has a Mohs hardness of about 3th and a poor cleavage on (CII). The density is 2.63(2) (meas.) and 2.64 g/cmr (calc.).

Goosecreekite, CaAl(2)Si(6)O16 center dot 5H(2)O, is monoclinic, space group P2(1) or P2(1)/m, with a 7.52(2), b 17.56(3), c 7.35(2) angstrom, beta 105.71 degrees, Z = 2. Microprobe and DTA-TGA analyses yield CaO 9.3, Al2O3 17.2, SiO2 59.3, H2O 15.0, sum 100.8 percent. This yields the calculated formula Ca(2.02)Al(4.10)Si(12.00)O32.17 center dot 10.12H(2)O, in agreement with the theoretical composition given for Z = 2. Goosecreekite is colorless and occurs in euhedral but highly curved crystals resembling some epistilbite. Goosecreekite is optically biaxial (-) with refractive indices alpha 1.495(2), beta 1.498(2), gamma 1.502(2); dispersion is indiscernible; orientation: Y parallel to b, and c Lambda Z = 46 degrees. The cleavage is perfect, parallel to {010}. The density is 2.21 (obs.); 2.16 g cm(-3) (calc.). Goosecreekite is found in the Luck Company Goose Creek quarry, Loudoun County, Virginia, in association with stilbite, epidote, babingtonite, titanite and chlorite, in varied parageneses. The name is for the locality. The unit-cell parameters and composition strongly suggest a structural relationship between goosecreekite and epistilbite and brewsterite.

Tancoite, a new species from the Tanco mine, Bernic Lake, Manitoba, occurs as small crystals associated with apatite and lithiophosphate in a pegmatite. Chemical analyses gave Li2O 5.2, Na2O 20.0, CaO 0.5, Al2O3 18.3, P2O5 50.1 and H2O 6.8, total 100.9 wt. %, leading to the formula H-1.13 Li0.98Na1.82Ca0.03Al1.01P1.99Os(OH), ideally, HLiNa2 Al(PO4)(2)(OH). The presence of hydroxyl and the absence of molecular water are shown by IR spectrometry. Tancoite is orthorhombic, space group Cmma, Cmmb, Cm2a or C2mb, with a 7.041(2), b 14.130(3), c 6.975(2) angstrom. and Z = 4. The strongest lines of the X-ray powder pattern are 4.672(100) (111), 3.413(90)(131), 3.150(100)(220,041,201), 2.479 (90)(042,202), 1.760(40)(400) and 1.438(40). The crystals are generally equant and show the forms {010}, {111}, {001}, {100} and {021}. Tancoite is colorless to pale pink, and has a vitreous lustre, white streak, Mohs hardness of 4-41/2, conchoidal fracture and fair cleavages {010} and {001}. The measured density is 2.752 g/cm(3), and the calculated density is 2.724 g/cm(3). Tancoite is optically biaxial negative; 2V alpha = 23 degrees (meas.), 24 degrees (calc.), r < nu weak; refractive indices alpha 1.541(2), beta 1.563(2), gamma 1.564(2), with orientation of the indicatrix X parallel to a, Y parallel to b, Z parallel to c. The mineral is named for the Tanco mine.