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Bendadaite, a new iron arsenate mineral of the arthurite group

Published online by Cambridge University Press:  05 July 2018

U. Kolitsch ,
D. Atencio ,
N. V. Chukanov ,
N. V. Zubkova ,
L. A. D. Menezes Filho ,
J. M. V. Coutinho ,
W. D. Birch ,
J. Schlüter ,
D. Pohl  and
A. R. Kampf
...Show all authors
U. Kolitsch*
Affiliation:
Mineralogisch-Petrographische Abt., Naturhistorisches Museum, Burgring 7, A-1010 Wien, Austria Institut für Mineralogie und Kristallographie, Universität Wien, Althanstr. 14, A-1090 Wien, Austria
D. Atencio
Affiliation:
Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508–080, São Paulo, SP, Brazil
N. V. Chukanov
Affiliation:
Institute of Problems of Chemical Physics, 142432 Chernogolovka, Moscow Oblast, Russia
N. V. Zubkova
Affiliation:
M.V. Lomonosov Moscow State University, Faculty of Geology, Vorobjovy Gory, 119899 Moscow, Russia
L. A. D. Menezes Filho
Affiliation:
Instituto de Geociências, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, 3127–901, Belo Horizonte, MG, Brazil
J. M. V. Coutinho
Affiliation:
Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508–080, São Paulo, SP, Brazil
W. D. Birch
Affiliation:
Department of Mineralogy, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia
J. Schlüter
Affiliation:
Mineralogisches Museum, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
D. Pohl
Affiliation:
Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
A. R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, CA 90007, USA
I. M. Steele
Affiliation:
Department of Geophysical Sciences, University of Chicago, 5734 S. Ellis Avenue, Chicago IL 60637, USA
G. Favreau
Affiliation:
421 av. Jean Monnet, F-13090 Aix-en-Provence, France
L. Nasdala
Affiliation:
Institut für Mineralogie und Kristallographie, Universität Wien, Althanstr. 14, A-1090 Wien, Austria
S. Möckel
Affiliation:
Neudorfer Str. 18, D-09629 Burkersdorf, Germany
G. Giester
Affiliation:
Institut für Mineralogie und Kristallographie, Universität Wien, Althanstr. 14, A-1090 Wien, Austria
D. Yu. Pushcharovsky
Affiliation:
M.V. Lomonosov Moscow State University, Faculty of Geology, Vorobjovy Gory, 119899 Moscow, Russia
*
*E-mail: uwe.kolitsch@nhm-wien.ac.at
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Abstract

Bendadaite, ideally Fe2+Fe23+ (AsO4)2(OH)2·4H2O, is a new member of the arthurite group. It was found as a weathering product of arsenopyrite on a single hand specimen from the phosphate pegmatite Bendada, central Portugal (type locality). Co-type locality is the granite pegmatite of Lavra do Almerindo (Almerindo mine), Linópolis, Divino das Laranjeiras county, Minas Gerais, Brazil. Further localities are the Veta Negra mine, Copiapó province, Chile; Oumlil-East, Bou Azzer district, Morocco; and Pira Inferida yard, Fenugu Sibiri mine, Gonnosfanadiga, Medio Campidano Province, Sardinia, Italy.

Type bendadaite occurs as blackish green to dark brownish tufts (<0.1 mm long) and flattened radiating aggregates, in intimate association with an intermediate member of the scorodite–mansfieldite series. It is monoclinic, space group P21/c, with a = 10.239(3) Å, b = 9.713(2) Å, c = 5.552(2) Å, β = 94.11(2)°, V = 550.7(2) Å3, Z = 2. Electron-microprobe analysis yielded (wt.%): CaO 0.04, MnO 0.03, CuO 0.06, ZnO 0.04, Fe2O3 (total) 43.92, Al2O3 1.15, SnO2 0.10, As2O5 43.27, P2O5 1.86, SO3 0.03. The empirical formula is (Fe2+0.52Fe3+0.32☐0.16)Σ1.00(Fe3+1.89Al0.11)Σ2.00(As1.87P0.13)Σ2.00O8(OH)2.00·4H2O based on 2(As,P) and assuming ideal 8O, 2(OH), 4H2O and complete occupancy of the ferric iron site by Fe3+ and Al. Optically, bendadaite is biaxial, positive, 2Vest. = 85±4°, 2Vcalc. = 88°, with α 1.734(3), β 1.759(3), γ 1.787(4). Pleochroism is medium strong: X pale reddish brown, Y yellowish brown, Z dark yellowish brown; absorption Z > Y > X, optical dispersion weak, r > v. Optical axis plane is parallel to (010), with X approximately parallel to a and Z nearly parallel to c. Bendadaite has vitreous to sub-adamantine luster, is translucent and non-fluorescent. It is brittle, shows irregular fracture and a good cleavage parallel to {010}. Dmeas. 3.15±0.10 g/cm3, Dcalc. 3.193 g/cm3 (for the empirical formula). The five strongest powder diffraction lines [d in Å (I)(hkl)] are 10.22 (10)(100), 7.036 (8)(110), 4.250 (5)(111), 2.865 (4)(), 4.833 (3)(020,011). The d spacings are very similar to those of its Zn analogue, ojuelaite. The crystal structure of bendadaite was solved and refined using a crystal from the co-type locality with the composition (Fe2+0.95☐0.05)Σ1.00(Fe3+1.80Al0.20)Σ2.00(As1.48P0.52)Σ2.00O8(OH)2·4H2O (R = 1.6%), and confirms an arthurite-type atomic arrangement.

Keywords

bendadaitenew mineraliron arsenatearthurite groupcrystal structureBendadaPortugal
Type
Research Article
Information
Mineralogical Magazine , Volume 74 , Issue 3 , June 2010 , pp. 469 - 486
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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