Geological and mineralogical research were conducted by the scanning probe microscopy and showed that in plagioclase pegmatites of North Baikal muscovite province the average thickness of the peristerites increases from early graphic zones to late trochlear zones and pegmatoid zones of pegmatite veins. The thickness reaches a maximum in the pegmatites of pegmatoid structure which contain large-crystalline muscovite. This regularity can be used for development mineralogical criteria for evaluation of pegmatite veins productivity at the large size muscovite source.
Geological and mineralogical research were conducted by the scanning probe microscopy and showed that in plagioclase pegmatites of North Baikal muscovite province the average thickness of the peristerites increases from early graphic zones to late trochlear zones and pegmatoid zones of pegmatite veins. The thickness reaches a maximum in the pegmatites of pegmatoid structure which contain large-crystalline muscovite. This regularity can be used for development mineralogical criteria for evaluation of pegmatite veins productivity at the large size muscovite source.
Physico-mathematical modeling has shown that color of iridescent depends on spacing of peristerite lattice. The more spacing lattice, the color of iridescent is higher. The phenomenon of iridescent in plagioclases has an interferential nature.We can select two genetic types of peristerites: peristerites of decomposition and segregation peristerites. Segregation peristerites are formed from postcrystallizational consolidation of peristerites of decomposition. The form of segregation pertisrerites is one of the reasons of polychromatic iridescent genesis in plagioclases.
Physico-mathematical modeling has shown that color of iridescent depends on spacing of peristerite lattice. The more spacing lattice, the color of iridescent is higher. The phenomenon of iridescent in plagioclases has an interferential nature.We can select two genetic types of peristerites: peristerites of decomposition and segregation peristerites. Segregation peristerites are formed from postcrystallizational consolidation of peristerites of decomposition. The form of segregation pertisrerites is one of the reasons of polychromatic iridescent genesis in plagioclases.
Spacing of lattice for non-indescent labradorite blue-indescent labradoric, green-irideseen labraderite and spacing increasees the dynamical trend for different kinds of labradorite, line non=iridescent labradorite ()107.5 +/- 10nm), blue-iridesecnt labrodorite (150 +/- 10 nm), green-iridescent labradorite (196 +/- 10nm), red-iridescent (231 +/- 10nm).This trend let is stae iridescent of these samples to be caused by interferecse of secondary order.
The small-angle X-ray scattering method was used to study samples of iridescent and non-iridescent labradorites, albite and quartz. An X-ray unit fitted with a U-shaped Kratky collimator was used in the research at the wavelength of 1,51 angstrom. 0,1-0,2 mm thick labradorite plates and powdered minerals were used as the samples; the plates were cut across the crystallographic axis. Anisotropic scattering has been found in the plates of iridescent labradorite for the first time in the history. This scattering is probably connected with structural defects in iridescent crystals, whose typical dimensions are 50-150 nm. The curves of small-angle X-ray scattering obtained for iridescent labradorite and albite in the "scattering intensity" - "inverse space vector module" coordinates show expressed rectilinear dependence on the log-log scale. The fractal parameter D of these curves equals 2. This proves that the investigated plagioclase powder particles are characterized with flat surface within a wide range of dimensions from 10 to 150 nm. Similar scattering characteristic were received when investigating the quartz powder. It may be preliminary hypothesized that these features of X-ray scattering do not depend on cleavage characteristics.
Were investigated powders of iridescent and no iridescent plagioclases (labradorite and albite) with using small-angle X-ray camera. Obtained curves of small-angle X-ray scattering in coordinates "scattering intensity" from "module of inverse space vector" show striking expressed rectilinear dependence in a double logarithmic scale. Fractal parameter D = 2 for the curves of small-angle X-ray scattering. That investigated plagioclase powders have in wide dimension interval from 10 to 150 nm flat surface. It may be hypothesized, that during reduction in size of mineral destruction take place predominantly along same planes. The same characteristic properties of scattering take place during investigating quartz powder. Were obtained the same rectilinear dependence and same fractal parameter D = 2. Previously it may be hypothesized, then at features of scattering X-ray not depends on cleavage of minerals.
Small-angle X-ray scattering at the wavelength of 1,51 angstrom was studied in samples of iridescent and non-iridescent labradorite. The samples were labradorite plates 0,1-0,2 mm thick, cut perpendicularly to the. crystallographic axis. For the experiments, the X-ray facility with Ushaped Kratky collimator was used.Scattering of two types, anisotropic and isotropic ones, was found for the first time. The anisotropic scattering is more typical of iridescent labradorites. It is observed at the angles of 1-5 mrad and decreases with the increase in scattering angle. Isotropic scattering reaches its maximum at the angle of 8 mrad, the maximum position being the same for all investigated samples both iridescent and non-iridescent.Anisotropic scattering is possibly connected to structural defects in iridescent crystals, whose typical dimensions are 500-1500 angstrom. Obviously, isotropic scattering is determined by structural specific features with linear dimensions of approximately 150-180 angstrom.
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