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The Canadian Mineralogist; August 2005; v. 43; no. 4; p. 1387-1391; DOI: 10.2113/gscanmin.43.4.1387
© 2005 Mineralogical Association of Canada
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Articles

THE CRYSTAL STRUCTURE OF COBALTARTHURITE FROM THE BOU AZZER DISTRICT, MOROCCO: THE LOCATION OF HYDROGEN ATOMS IN THE ARTHURITE STRUCTURE-TYPE

Anthony R. Kampf§

Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, U.S.A.

§ E-mail address: akampf{at}nhm.org

The crystal structure of cobaltarthurite, ideally Co2+Fe3+2(AsO4)2(OH)2·4H2O, monoclinic, P21/c, a 10.2635(9), b 9.7028(8), c 5.5711(5) Å, ß 94.2070(10)°, from Khder, Bou Azzer district, Morocco, has been refined to R1 = 1.8%, wR2 = 6.4% using1343 unique [Fo > 4{sigma} (Fo)] reflections collected with a Bruker 1K SMART Platform CCD diffractometer and MoK{alpha} radiation. This is the best determination of the structure of an arthurite-group mineral yet obtained, and for the first time has allowed the determination of hydrogen positions. The hydrogen bonding scheme proposed in previous studies on arthurite-group minerals is confirmed with one change.

Keywords: cobaltarthurite, arthurite group, crystal structure, hydrogen bonding, Bou Azzer, Morocco.






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