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Arizona porphyry copper/hydrothermal deposits I. The structure of chenevixite and luetheite

Published online by Cambridge University Press:  25 June 2018

P. C. Burns ,
J. V. Smith  and
I. M. Steele
P. C. Burns*
Affiliation:
Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick, Notre Dame, IN 46556, U.S.A.
J. V. Smith
Affiliation:
Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637, U.S.A.
I. M. Steele
Affiliation:
Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637, U.S.A.
*
*E-mail: [email protected]
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Abstract

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, β = 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≥4σF) reflections collected for a twinned microcrystal using graphite-monochromated Mo-Kα X-rays and a CCD area detector. Vertex- and edge-sharing arsenate tetrahedra, Alϕ6 octahedra, and Jahn-Teller-distorted Cu2+ϕ6 octahedra [ϕ: O2−;, (OH)−;] form a framework unique from those in Cu2+ oxysalt minerals. Chains of edge-sharing Cu2+ϕ6 octahedra, with Alϕ6 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 frameworkby the sharing of polyhedral elements between adjacent Alϕ6 octahedra, as well as between AsO4 tetrahedra and Alϕ6 octahedra.

Keywords

chenevixiteluetheiteCu oxysaltstructure determinationCCD detector
Type
Research Article
Information
Mineralogical Magazine , Volume 64 , Issue 1 , February 2000 , pp. 25 - s8
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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