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Clinopyroxene with Si < AlIV in the join CaFeAISiO6-CaTiAl2O6

Published online by Cambridge University Press:  05 July 2018

Kosuke Onuma  and
Masahide Akasaka
Kosuke Onuma
Affiliation:
Department of Geology and Mineralogy, Hokkaido University, Sapporo 060, Japan
Masahide Akasaka
Affiliation:
Department of Geology and Mineralogy, Hokkaido University, Sapporo 060, Japan
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Summary

Unusual clinopyroxenes were synthesized in the study of the join CaFeAlSiO6-CaTiAl2O6 in air at I atm. Clinopyroxene solid solution, hibonite solid solution, X-phase, perovskite, and corundum are present, and at subsolidus temperatures the clinopyroxene singlephase field extends up to about 19 wt% CaTiAl2O6. The CaTiAl2O6 component in the clinopyroxene however increases beyond the clinopyroxene single-phase field and attains 23 wt%. These clinopyroxene solid solutions are extremely poor in SiO2 and extremely rich in Al2O3, Fe2O3, and TiO2, and more than half of tetrahedral sites are occupied by AlIV, contravening the aluminium avoidance principle.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 331 , September 1980 , pp. 851 - 856
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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