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Crystal chemistry of Cr3+-V3+-rich clinopyroxenes
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March 28, 2015
Abstract
Eleven clinopyroxenes from the Sludyanka Crystalline Complex in Russia belonging to the ternary join NaVSi2O6-NaCrSi2O6-CaMgSi2O6 (natalyite-kosmochlor-diopside) were studied by means of X-ray single crystal diffractometry and electron probe microanalysis.
The crystal chemical data show that the T site is almost completely occupied by Si, so that the Na (V3+,Cr3+) → Ca Mg substitution mechanism ensures charge balance. Changes in M1 site geometry are explained by the aggregate ionic radius, and are influenced by Mg occupancy and V3+/(V3+ + Cr3+) ratio. The M2 site geometry depends both on Na content and on the (V3+,Cr3+) → Mg substitution in M1 site. Changes in M2-O3c1 bond length are mainly related to Na content, whereas the longest M2-O3c2 bond lengths are significantly affected by the V3+/(V3+ + Cr3+) ratio of the M1 site. The T site geometry is affected by chemical and geometrical variations at the M1 and M2 sites, principally the M1 site occupancy.
Received: 2001-4-4
Accepted: 2001-12-24
Published Online: 2015-3-28
Published in Print: 2002-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Hydroxyl in MgSiO3 akimotoite: A polarized and high-pressure IR study
- High-pressure IR-spectra and the thermodynamic properties of chloritoid
- Infrared and Raman study of interlayer anions CO32–, NO3–, SO42– and ClO4– in Mg/Al-hydrotalcite
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- High-pressure single-crystal X-ray diffraction study of katoite hydrogarnet: Evidence for a phase transition from Ia3d →I4̅3d symmetry at 5 GPa
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- Surface structures, stabilities, and growth of magnesian calcites: A computational investigation from the perspective of dolomite formation
- Spinels and other oxides in Mn-rich rocks from the Hutter Mine, Pittsylvania County, Virginia, U.S.A.: Implications for miscibility and solvus relations among jacobsite, galaxite, and magnetite
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- Neustädtelite and cobaltneustädtelite, the Fe3+ - and Co2+ -analogues of medenbachite
- Ciprianiite and mottanaite-(Ce), two new minerals of the hellandite group from Latium (Italy)
- Re-definition, nomenclature and crystal-chemistry of the hellandite group
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