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Petewilliamsite, (Ni,Co)₃₀(As₂O₇)₁₅, a new mineral from Johanngeorgenstadt, Saxony, Germany: description and crystal structure

¹ Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
² Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick, University of Notre Dame, Notre Dame, Indiana 46556–0767, USA
³ Canadian Museum of Nature, P.O. Box 3443, Station D, Ottawa, Ontario K1P 6P4, Canada
⁴ Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
⁵ Box 3921, Duke Medical Center, Durham, North Carolina 27710, USA

View larger version (125K): [in a new window]   FIG. 1. SEM image of a portion of a petewilliamsite aggregate. Note the rounded nature of the crystal faces.

View larger version (54K): [in a new window]   FIG. 2 (a,b). Polyhedral representations of the structure of Ni2(As2O7) (Buckley et al., 1990). NiO6 octahedra are shaded with parallel lines, and arsenate tetrahedra are shaded solid grey.

View larger version (75K): [in a new window]   FIG. 3. Polyhedral representation of the structure of petewilliamsite. MOn polyhedra are shaded with parallel lines, and arsenate tetrahedra are shaded solid grey.

View larger version (57K): [in a new window]   FIG. 4. Polyhedral representations of the sheets of MOn polyhedra in the structure of petewilliamsite projected onto (110): (a) layer at z 0; (b) layer at z 0.33. MOn polyhedra are shaded with parallel lines.