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Now showing items 3425-3444 of 39124
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(2001)Six kaolinite [A12Si2O5(OH)4] samples were synthesized under different conditions of temperature, pressure, and pH from two different starting materials. Chemical composition and properties of the samples were characterized ...
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(1988)Crystal size distributions (CSDs) measured in metamorphic rocks yield quantitative information about crystal nucleation and growth rates, growth times, and the degree of overstepping (T) of reactions during metamorphism. ...
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(2002)This study demonstrates the value of the combined use of scaling analysis and crystal size distribution (CSD) measurements in the interpretation of igneous textures and outlines applications of these methods to other ...
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(2003)Crystal size distributions (CSDs) of quartz and zircon phenocrysts in individual pumice clasts from several voluminous ash-flow tuffs provide a quenched snapshot view of con-ditions in preclimactic magma chambers. A common ...
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(2005)The crystal chemistry of three Li-bearing mica-2M2 crystals from pegmatites has been studied by chemical analyses and single crystal X-ray diffraction; their belonging to the trilithionite-polylithionite join is highlighted ...
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(1999)The crystal structure of a synthetic two-layer polytype of CaSiO 3 pseudowollastonite was determined using single-crystal X-ray diffraction data. It is monoclinic with space group C2/c and unit-cell parameters a = 11.8322(6), ...
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(2002)The crystal structure of a synthetic potassic-ferri-ferrorichterite, ideally K(Ca0.5Na1.5)Fe5Si8O22(OH)(2) was refined from single-crystal X-ray imaging plate diffraction data at 298 K and I 10 K. The title compound is ...
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(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 ...
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(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 ...
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(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 ...
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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 ...
Now showing items 3425-3444 of 39124