Acta Cryst. (2007). E63, i122-i124  [ doi:10.1107/S1600536807015048 ]

Single-crystal X-ray refinement of wilkinsonite, Na₂Fe₄²⁺Fe₂³⁺Si₆O₂₀

J. B. Burt, R. T. Downs and G. Costin

Abstract: This is the first structural refinement of the mineral wilkinsonite, Na₂Fe₄²⁺Fe₂³⁺Si₆O₂₀. Wilkinsonite is a member of the aenigmatite group and consists of bands of Fe octahedra connected to eight-coordinated Na polyhedra forming sheets parallel to (011), which are interconnected by chains of [Si₆O₁₈] and Fe octahedra. The site occupancies of the different valence states of Fe have been determined from bond distances and bond valence

Online 18 April 2007

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