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Bariopharmacoalumite, a new mineral species from Cap Garonne, France and Mina Grande, Chile

Published online by Cambridge University Press:  05 July 2018

S. J. Mills ,
M. S. Rumsey ,
G. Favreau ,
J. Spratt ,
M. Raudsepp  and
M. Dini
S. J. Mills*
Affiliation:
Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Rd, Vancouver, British Columbia, Canada V6T 1Z4
M. S. Rumsey
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
G. Favreau
Affiliation:
421 Avenue Jean Monnet, 13090 Aix-en-Provence, France
J. Spratt
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
M. Raudsepp
Affiliation:
Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Rd, Vancouver, British Columbia, Canada V6T 1Z4
M. Dini
Affiliation:
Escuela de Sociología, Universidad Central, Av. Franciscode Aguirre 0405, La Serena, Chile
*
*E-mail: smills@nhm.org
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Abstract

Bariopharmacoalumite, ideally Ba0.5Al4(AsO4)3(OH)4·4H2O, is a new mineral from Cap Garonne, France. It occurs in several places within the mine as colourless to pale yellow interpenetrating cubes up to 0.5 mm across. Bariopharmacoalumite is transparent to translucent, with a white streak, has an adamantine lustre and imperfect cleavage on {001}. The Vickers hardness is 234.35 and the Mohs harness is 3.5. Bariopharmacoalumite is isotropic, with n = 1.573 (upper estimate) [calculated from reflectance values at 589 nm using Fresnel Equations]. The empirical formula, based on 20 oxygen atoms, is: (Ba0.54Cu0.03K0.01)Σ0.58(Al3.99Fe0.02)Σ4.01(AsO4)3.00(OH)3.85O0.15·4H2O and the calculated density (on the basis of the empirical formula and single-crystal unit cell) is 2.580 g/cm3. The four strongest lines in the X-ray powder diffraction pattern are [dobs(Å), Iobs,(hkl)]: 7.759, 100, (001); 5.485, 27, (011); 3.878, 27, (002); 4.454, 18, (011). Bariopharmacoalumite from Cap Garonne is cubic, space group P4̄3m with a = 7.742(4) Å, V = 464.2(4) Å3 and Z = 1. The crystal structure was solved by direct methods and refined to R1 = 0.0705 for 215 reflections with I > 4σ(I) and is consistent with members of the pharmacosiderite supergroup. Data are also presented from zoned bariopharmacoalumite–bariopharmacosiderite crystals found at the Mina Grande mine, Chile.

Keywords

bariopharmacoalumitebariopharmacosideritecrystal structureCap Garonnenew mineralMina Grande minepharmacosiderite supergroupChile
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 1 , February 2011 , pp. 135 - 144
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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Footnotes

Present address: Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 9007, USA

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