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Mineralogical Magazine; February 2000; v. 64; no. 1; p. 25-30
© 2000 Mineralogical Society of Great Britain and Ireland
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Arizona porphyry copper/hydrothermal deposits I. The structure of chenevixite and luetheite

P. C. Burns1,*, J. V. Smith2 and I. M. Steele2

1 Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick, Notre Dame, IN 46556, U.S.A.
2 Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637, U.S.A.

* E-mail: pburns{at}nd.edu

The crystal structure of chenevixite, Cu2M2(AsO4)2(OH)4 (where M = Fe3+ or Al), pseudo-orthorhombic, monoclinic, a = 5.7012(8), b = 5.1801(7), c = 29.265(2) Å, ß = 89.99(1)°, V = 864.3(4) Å3, space group B1211, Z = 4, was solved by direct methods and refined by least-squares techniques to R = 8.4% and a goodness-of-fit (S) of 1.37 for 1176 unique observed (F>=4{sigma}F) reflections collected for a twinned microcrystal using graphite-monochromated Mo-K{alpha} X-rays and a CCD area detector. Vertex- and edge-sharing arsenate tetrahedra, Al{phi}6 octahedra, and Jahn-Teller-distorted Cu2+{phi}6 octahedra [{phi}: O2–, (OH) –] form a framework unique from those in Cu2+ oxysalt minerals. Chains of edge-sharing Cu2+{phi}6 octahedra, with Al{phi}6 octahedra attached on opposing sides by the sharing of edges, are linked into layers parallel to (001) by sharing vertices with AsO4 tetrahedra, and the layers are linked to form a framework by the sharing of polyhedral elements between adjacent Al{phi}6 octahedra, as well as between AsO4 tetrahedra and Al{phi}6 octahedra.

KEYWORDS: chenevixite, luetheite, Cu oxysalt, structure determination, CCD detector




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