Isokite, CaMg(PO4)F0.8(OH)0.2, isomorphous with titanite

Hexiong Yang, Justin Zwick, Robert T. Downs, Gelu Costin

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

This study presents the first structural report of natural isokite (calcium magnesium phosphate fluoride), with the formula CaMg(PO4)F0.8(OH)0.2 (i.e. some substitution of OH for F), based on single-crystal X-ray diffraction data. Isokite belongs to the C2/c titanite mineral group, in which Mg is on an inversion centre and the Ca, P and F/OH atoms are on twofold axes. The structure is composed of kinked chains of corner-sharing MgO4F2 octa-hedra that are crosslinked by isolated PO4 tetra-hedra, forming a three-dimensional polyhedral network. The Ca2+ cations occupy the inter-stitial sites, coordinated by six O atoms and one F anion.

Original languageEnglish (US)
Pages (from-to)i89-i90
JournalActa Crystallographica Section C: Crystal Structure Communications
Volume63
Issue number10
DOIs
StatePublished - Sep 22 2007

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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