Results 191 to 200 of about 27,724 (241)

Properties of clinopyroxene LiFeGe2O6

Physics of the Solid State, 2010
The polycrystalline compound LiFeGe2O6 has been synthesized by the solid-phase reaction. The X-ray diffraction, Mossbauer, calorimetric, and magnetic investigations have been carried out. The Mossbauer spectrum at 300 K represents a single quadrupole doublet.
T. V. Drokina, G. A. Petrakovskiĭ, O. A. Bayukov, A. F. Bovina, R. Shimchak, D. A. Velikanov, A. V. Kartashev, A. L. Volkova, D. A. Ivanov, G. N. Stepanov   +9 more
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Raman spectroscopy of CaCoSi2O6–Co2Si2O6 clinopyroxenes

Physics and Chemistry of Minerals, 2014
Raman spectra were collected on a set of synthetic clinopyroxenes along the series CaCoSi2O6–Co2Si2O6. Changes in peak position and peak width show: (1) evidence of a phase transition from C2/c to P21/c, at Ca0.4Co1.6Si2O6, in agreement with previous X-ray observations; (2) peak broadening for intermediate compositions, with sharper peaks close to the ...
MANTOVANI, Luciana, TRIBAUDINO, Mario, ALIATIS, Irene, LAMBRUSCHI, Erica, LOTTICI, Pier Paolo, BERSANI, Danilo   +5 more
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Clinopyroxene dissolution in basaltic melt

Geochimica et Cosmochimica Acta, 2009
Abstract The history of magmatic systems may be inferred from reactions between mantle xenoliths and host basalt if the thermodynamics and kinetics of the reactions are quantified. To study diffusive and convective clinopyroxene dissolution in silicate melts, diffusive clinopyroxene dissolution experiments were conducted at 0.47–1.90 GPa and 1509 ...
Yang Chen, Youxue Zhang
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Garnet-clinopyroxene geothermometer

Contributions to Mineralogy and Petrology, 1979
A garnet-clinopyroxene geothermometer based on the available experimental data on compositions of coexisting phases in the system MgO-FeO-MnO-Al2O3-Na2O-SiO2 is as follows: $$T({\text{}}K) = \frac{{8288 + 0.0276 P {\text{(bar)}} + Q1 - Q2}}{{1.987 \ln K_{\text{D}} + 2.4083}}$$
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Potassium in Clinopyroxene Inclusions from Diamonds

Science, 1991
Analytical transmission electron microscopy, electron microprobe analyses, and single-crystal x-ray diffraction data support the conclusion that high potassium contents, up to 1.5 weight percent K 2 O, of some diopside and omphacite inclusions from diamonds represent valid clinopyroxene compositions with K in solid ...
G E, Harlow, D R, Veblen
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Transcrystalline melt migration in clinopyroxene

Contributions to Mineralogy and Petrology, 2010
Glass inclusions in clinopyroxene phenocrysts from La Sommata (Vulcano Island, Aeolian Arc) were reheated and submitted to a sustained thermal gradient. Each remelted inclusion undergoes a transient textural and chemical reequilibration and concomitantly begins to migrate along a crystallographic direction, at a small angle with the thermal gradient ...
Sonzogni, Yann, Provost, Ariel, Schiano, Pierre   +2 more
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Apollo 12 clinopyroxenes: Chemical trends

Earth and Planetary Science Letters, 1970
Clinopyroxenes from Apollo 12 rocks studied by X ray diffraction and electron microprobe methods, noting phenocrysts, chemical composition and ...
A.E. Bence, J.J. Papike, C.T. Prewitt
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Clinopyroxene from Brazilian kamafugites

Lithos, 2000
Abstract The composition of pyroxenes from the two occurrences of kamafugites in Brazil — Santo Antonio da Barra and Mata da Corda — was investigated with the aim of comparing the localities and characterizing kamafugitic pyroxenes in general. Kamafugitic pyroxene is always diopside, except for late phases that can be richer in aegirine.
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Pb diffusion in clinopyroxene

Chemical Geology, 1998
Abstract Chemical diffusion of Pb under anhydrous, pO2-buffered conditions has been measured in natural clinopyroxenes of two different compositions: one a near-end-member diopside and the other of more iron-rich composition (∼40% diopside component).
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Garnet–clinopyroxene and clinopyroxene geothermobarometry of deep mantle and crust eclogites and peridotites

Lithos, 2008
Abstract Eclogite is one of the major types of xenoliths in kimberlite. An investigation of such xenoliths provides important constraints on the distribution of P and T within the upper mantle and its chemical composition. Garnet–clinopyroxene and clinopyroxene barometers are proposed for mantle eclogites and peridotites on the basis of CaTs ...
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