Incorporation of Co in the dolomite structure: Coupled EPMA and single crystal structural studies of co-rich dolomite from the tenke-fungurume district, democratic Republic of Congo

Natale Perchiazzi, Isabel F. Barton, Pietro Vignola

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Structural variations in Co-rich dolomite from the Tenke-Fungurume district, Democratic Republic of Congo, have been examined with coupled EPMA and single-crystal structure refinements for Co contents up to 0.30 atoms per formula unit. Full occupation of Ca at the A site is constantly found, with progressive Co incorporation at the B structural site leading to isotropic expansion of the B coordination octahedra and a corresponding anisotropic contraction of the A polyhedra, mainly achieved through the shortening of ''basal'' polyhedral edges. The simultaneous opposing variation of AO6 and BO6 polyhedra explains the strongly anisotropic expansion of the unit-cell parameters.

Original languageEnglish (US)
Pages (from-to)151-158
Number of pages8
JournalCanadian Mineralogist
Volume56
Issue number2
DOIs
StatePublished - Mar 31 2018

Keywords

  • Cobalt incorporation
  • Crystal structure adaptation
  • Dolomite

ASJC Scopus subject areas

  • Geochemistry and Petrology

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