Browsing ELibrary by Title
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- Browsing ELibrary by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing ELibrary by Title
Now showing items 2698-2717 of 21934
-
(1996)We report a structure refinement of a P2/m ferromagnesian cummingtonite crystal with Fe/(Mg + Fe) = 0.37 at 140 K; this crystal was inverted from the C2/m structure, which is stable at room temperature. The phase-transition ...
-
(1987)Goldfieldite has the general formula (Cu, Fe, Ag) 12-x (Te, Sb, As, Bi) 4S 13-y, where Te > Sb + As + Bi. It is a rare mineral that can be formed only in a narrow range of physical and chemical conditions, namely a combination ...
-
(2004)The crystal structure of filatovite, K[(Al,Zn)2(As,Si 2O8] (monoclinic, I2/c, a = 8.772(1), b = 13.370(2, c = 14.690(2) Å, β = 115.944(6)°, V = 1549.1(4) Å3) has been solved by direct methods and refined to R1 = 0.033 on ...
-
(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 ...
-
(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 ...
-
(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), ...
-
(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) ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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 ...
-
(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, ...
-
(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 ...
-
(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, ...
-
(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 ...
-
(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 ...
-
(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) ...
-
(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, ...
-
(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 ...
-
(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 ...
Now showing items 2698-2717 of 21934