'Face-to-face' relationships between oxocentered tetrahedra and cation-centred tetrahedral oxyanions in crystal structures of minerals and inorganic compounds

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23 Scopus citations

Abstract

Detailed analysis of the crystal structures of minerals and inorganic compounds containing oxocentred [OCu4] tetrahedra reveals the following principle for relationships between oxocentred tetrahedra and tetrahedral oxyanions (T(n+)O4)(-(8-n)) with T = S6+ or V5+, or triangular pyramidal oxyanions (SeO3)2- (which may be considered as (SeO3E)2- tetrahedra assuming the lone pair E of selenium to be a fourth ligand): (T(n+)O4)(-(8-n)) tetrahedra are 'attached' to the oxocentred tetrahedra so that their grounds (O-O-O and Cu-Cu-Cu) are parallel to each other and the mutual orientation is regular (O corners are exactly under Cu corners). We propose to describe these relationships as 'face-to-face', meaning that the oxocentred and cation-centred tetrahedra 'meet' along their 'whole' triangular faces. Geometric characteristics of 'face-to-face' relationships are discussed.

Original languageEnglish
Pages (from-to)263-266
Number of pages4
JournalMineralogical Magazine
Volume63
Issue number2
DOIs
StatePublished - Apr 1999

Scopus subject areas

  • Geochemistry and Petrology

Keywords

  • Cation-centred tetrahedra
  • Crystal structure
  • Oxocentred tetrahedra
  • Oxyanions

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