Twinning in meteoritic and synthetic perovskite

L. P. Keller, P R Buseck

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Abstract

Transmission electron microscope observations of end-member perovskite from two carbonaceous chondrite meteorites show that fine-scale twinning is common. Three twin laws are observed: 1) a 90° rotation around [101], 2) a 180° rotation around [101], and 3) a 180° rotation around [121]. The results indciate that meteoritic perovskite displaying (121) twins was heated to temperatures above the cubic-orthorhombic phase transition (~1573 K) and rapidly cooled. This constraint strongly limits the mechanism responsible for the formation of perovskite in these meteorites. -from Authors

Original languageEnglish (US)
Pages (from-to)73-79
Number of pages7
JournalAmerican Mineralogist
Volume79
Issue number1-2
StatePublished - Jan 1 1994

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ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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