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Acta Cryst. (2008). E64, i62 [ doi:10.1107/S1600536808026688 ]
Abstract: Safflorite, a naturally occurring cobalt-nickel-iron diarsenide (Co,Ni,Fe)As2, possesses the marcasite-type structure, with cations (M = Co + Ni + Fe) at site symmetry 2/m and As anions at m. The MAs6 octahedra share two edges, forming chains parallel to c. The chemical formula for safflorite should be expressed as (Co,Ni,Fe)As2, rather than the end-member format CoAs2, as its structure stabilization requires the simultaneous interaction of the electronic states of Co, Ni, and Fe with As22- dianions.
Online 23 August 2008
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