Unusual forms of magnetite in the Orgueil carbonaceous chondrite

Xin Hua, P R Buseck

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

The Orgueil CI carbonaceous chondrite contains magnetite (Fe3O4) that displays a rich and seemingly unique variety of morphologies. While many have already been described, recent images provide far greater definition and, thus, provide more unambiguous identification of trapezohedral crystals and possibly also trisoctahedral forms. Although it is an extremely abundant terrestrial mineral and commonly occurs in well-developed crystals, neither of these forms have been recognized previously from magnetite. The barrel-shaped arrays of magnetite discs ("plaquettes") are also unique. It appears as if the circumstances for the formation of these unusual crystals were somehow exceptional. Their morphologies and association with sulfates and carbonates suggest an aqueous origin.

Original languageEnglish (US)
Pages (from-to)A215-A220
JournalMeteoritics and Planetary Science
Volume33
Issue number4 SUPPL.
StatePublished - Jul 1 1998

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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