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Pyroxenes from non-carbonaceous chondritic meteorites

Published online by Cambridge University Press:  05 July 2018

R. A. Binns
R. A. Binns*
Affiliation:
Department of Geology, University of New England, Armidale, New South Wales, Australia
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Summary

Chemical, optical, and X-ray data are presented for pyroxenes from a representative selection of chondrites. The Mg-Fe pyroxenes originally crystallized above 1000-1200 °C as the protoenstatite-protohypersthene polymorph, and inverted on cooling to the polysynthetically twinned clinoenstatite-clinohypersthene polymorph. In most chondrites the latter became converted to orthopyroxene during recrystallization at temperatures ranging up to 900 to 950 °C. The contents of certain minor elements changed during the clino-ortho inversion. Ancestral protoenstatiteprotohypersthene may have been slightly non-stoichiometric. Accessory Ca-rich pyroxenes are discussed briefly.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 290 , June 1970 , pp. 649 - 669
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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