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Omsite, (Ni, Cu)2Fe3+(OH)6[Sb(OH)6], a new member of the cualstibite group from Oms, France

Published online by Cambridge University Press:  05 July 2018

S. J. Mills ,
A. R. Kampf ,
R. M. Housley ,
G. Favreau ,
M. Pasero ,
C. Biagioni ,
S. Merlino ,
C. Berbain  and
P. Orlandi
S. J. Mills*
Affiliation:
Geosciences, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia
A. R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
R. M. Housley
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA
G. Favreau
Affiliation:
421 Avenue Jean Monnet, 13090 Aix-en-Provence, France
M. Pasero
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Pisa, Via S. Maria 53, I-56126 Pisa, Italy
C. Biagioni
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Pisa, Via S. Maria 53, I-56126 Pisa, Italy
S. Merlino
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Pisa, Via S. Maria 53, I-56126 Pisa, Italy
C. Berbain
Affiliation:
32 rue R. Cassin, 66270 Le Soler, Pyrénées-Orientales, France
P. Orlandi
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Pisa, Via S. Maria 53, I-56126 Pisa, Italy
*
*E-mail: smills@museum.vic.gov.au
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Abstract

Omsite (IMA 2012-025) is a new mineral from the Correc d'en Llinassos, Oms, Pyrénées-Orientales Department, France. It occurs as bright yellow to amber yellow discoidal tablets, flattened on {001}, which form rosettes typically 50–100 μm in diameter. Omsite generally crystallizes on siderite without associated supergene minerals; it occurs less commonly with glaukosphaerite. Crystals have a vitreous to resinous lustre, and are transparent to translucent. Omsite is not fluorescent in either short-wave or long-wave ultraviolet light. It has an estimated hardness of 3 on the Mohs' scale, is brittle with an irregular fracture, and has one poor cleavage on {001}. The calculated density is 3.378 g cm–3. Crystals are uniaxial (–), with indices of refraction of ω = 1.728(3) and ε = 1.66(1), measured in white light. Pleochroism is ω = orange-yellow, ε = pale orange-yellow; ω > ε. The empirical formula [based on 12 (OH + Cl) p.f.u.] is (Ni1.0992+Cu0.6652+Mg0.107Fe0.0453+)Σ 1.916Fe1.0003+(Sb0.9475+As0.072Na0.029)Σ1.048OH11.967Cl0.033. Omsite crystallizes in space group P, with unit-cell parameters a = 5.3506(8), c = 19.5802(15) Å, V = 485.46(10) Å3 and Z = 2 determined by single crystal X-ray diffraction. The five strongest lines in the X-ray powder diffraction pattern [d in Å, (Irel), (hkl)] are as follows: 4.901, (100), (004); 4.575, (83), (011); 2.3539, (81), (11); 1.8079, (48), (11); 3.781, (34), (103). The crystal structure was solved to R1 = 0.0896 for 356 observed reflections [Fo>4σFo] and 0.1018 for all the 469 unique reflections. Omsite is a layered double hydroxide (LDH) mineral, with a topology consistent with members of the hydrotalcite supergroup and cualstibite group.

Keywords

omsitezincalstibitecualstibitehydrotalcitelayered double hydroxideLDHpolytypecrystal structure
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 5 , October 2012 , pp. 1347 - 1354
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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