Synthesis of kosmochlor and phase equilibria in the join CaMgSi2O6-NaCrSi2O6 |
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| Authors: | Ko Ikeda Kenzo Yagi |
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| Institution: | (1) Department of Geology and Mineralogy, Hokkaido University, Sapporo, Japan;(2) Present address: Department of Mining and Mineral Engineering, Yamaguchi University, Ube, Japan |
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| Abstract: | Kosmochlor (NaCrSi2O6) was synthesized by the flux method from melts along the join Na2O·2 SiO2-Na2O·Cr2O3·4 SiO2 at 1000° C in air, and isolated by dissolving the glassy matrix with hydrofluoric and perchloric acids. The join CaMgSi2O6-NaCrSi2O6 was studied at 1 atmosphere in air by the quenching technique at temperatures between 900° and 1450° C, using mixtures of kosmochlor and diopside crystals or diopside glass as starting materials. The phases are diopside solid solution, kosmochlor, spinel (Mg-chromite), eskolaite (Cr2O3) and glass. The maximum solubility of kosmochlor in diopside is 24 wt percent at 1140° C, while diopside is not soluble at all in kosmochlor, resulting in the existence of a wide range of immiscibility. Petrologic significance of the results is discussed. |
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