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Browsing Геология России by Title
Now showing items 3435-3454 of 39126
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(2000)The crystal structure of isolueshite, a recently described member of the perovskite group from the Khibina complex (Russia), was refined by single-crystal methods in the space group Pm3m [a = 3.909(1) Å] to R = 0.031 and ...
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(1988)The study was done on laitakarite-bearing ore samples from the Nevskoye tin deposit in northeastern USSR and from the Orijarvi mine. In the polished sections studied, laitakarite is present as flaky grains a large as 0.8 ...
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(2004)Mahnertite, (Na0.88Ca0.12)Cu-2.75[AsO4](2)Cl-0.62.3.63H(2)O, M = 565.17, is tetragonal, with space group I4/mmm, a = 10.037(1), c = 23.739(1) Angstrom, V = 2391.5(4) Angstrom(3), Z = 8, rho(o) = 3.32, rho(c) = 3.14 g/cm(3), ...
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(2000)The crystal structure of Na4[Cu4O2(SO4)4] MeCl (Me: Na, Cu, Box) has been solved by direct methods and refined to R1 = 0.028 using 2466 independent reflections. The compound is tetragonal with space group P4/n, a = 18.451(1) ...
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(2001)Phase X, ascribed by Luth (1995) to a hydrous K-rich silicate formed from the breakdown of K-amphibole at high pressures, was synthesized at 1250–1300 °C and 10–16 GPa in four different compositions: Na1.78(Mg1.89Al0.13)Si2.02O7 ...
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(2000)Pushcharovskite, K0.02Cu1.125As0.94O5.515H4.06 (ideally CuAsO3(OH)·1.5H2O), M = 235.02, is triclinic, with space group P1, a = 13.6164(7), b = 15.6672(8), c = 19.1869(9) Å, α = 106.933(2), β = 91.531(2), γ = 98.401(2)°, V ...
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(2002)The crystal structure of rimkorolgite, ideally Ba[Mg-5(H2O)(7)(PO4)(4)](H2O), (monoclinic, P2(1)/c, a = 8.3354(9), b = 12.8304(13), c = 18.313(2) Angstrom, beta = 90.025(2)degrees, V = 1958.5(4) Angstrom(3), Z = 4) has ...
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(1989)Ponomarevite is one of the principal minerals of Recent exhalation ore shows on the cones of the Great Tolbachik Fissure Eruption of 1975-76. Interpreting its crystal structure helps to identify the forms of transport of ...
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(2003)The crystal structure of sahlinite [Pb14(AsO4)2O9Cl4] from Långban (Sweden) has been refined up to R = 0.071 using single-crystal diffraction data collected at the Elettra synchrotron facility. Sahlinite is monoclinic, ...
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(2003)Maya Blue, a synthetic pigment produced by the ancient Mayas, is a combination of a specific clay, palygorskite (or sepiolite), containing large channels in the crystal structure and the organic dye indigo. Little is known ...
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(2003)The crystals of lamprophyllite-2M and lamprophyllite-2O were found coexisting in an ussingite-microcline-sodalite veins in the Alluaiv Mt., Lovozero alkaline massif, in association with ussingite, aegirine, microcline, ...
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(2001)According to the recommended nomenclature for zeolite minerals (Coombs et al. 1998), there are more than eighty distinct zeolite species. Table 11 (see Appendix below) is a listing of the zeolite minerals discussed in this ...
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(2004)Electron-microprobe analyses (EMPA) and Mossbauer spectra (MS) have been acquired for natural tourmalines sampled near Crummock Water and Haweswater, English Lake District. In the former, the dravite-schorl series is ...
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(1999)Fossil biogenic apatites display rare-earth element (REE) patterns which have been proposed to reflect environmental and biological controls on past seawater composition. These patterns can be separated in two groups: (1) ...
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(1991)The isothermal (750°C) experiments of Lagache and Dujon (1987) reveal that the partitioning of Sr between plagioclase feldspar and hydrothermal solutions is a funtion of the anorthite (An) content of the plagioclase, ...
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(2001)We have analyzed the implications of [Mg](VI)double right arrow [Fe2+](VI) isomorphous substitution in the periclase structure (B1) which forms, under lithospheric P, T conditions, only very limited solid solutions with ...
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(2004)The crystal-chemistry of fifteen samples of talc from various localities and origins having a relatively wide range of Fe, Al, and F contents, have been studied mainly by Fourier-transform infrared (FTIR) spectroscopy, in ...
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(2002)Crystal–liquid equilibria, including phase relationships of minerals with silicate and/or carbonate melts, are reviewed in order to understand the occurrence of clinopyroxene with up to 2 wt.% K2O (KCpx). This mineral ...
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(2001)Sedimentary greigite (Fe3S4) can form either by ''biologically controlled'' or by ''biologically induced mineralization'' (BCM and BIM, respectively). In order to identify the origin of magnetic Fe sulfides, we studied and ...
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(2003)Spectra for certain comets show the presence of crystalline silicate dust grains believed to have been incorporated during comet formation. While grain crystallization is widely assumed to result from the thermal annealing ...
Now showing items 3435-3454 of 39126