Bendadaite, a new iron arsenate mineral of the arthurite group
- Author(s)
- Uwe Kolitsch, D. Atencio, N V Chukanov, Natalia V Zubkova, L.A.D. Menezes Filho, J.M.V. Coutinho, William D. Birch, Jochen Schlüter, D. Pohl, Anthony R. Kampf, Ian M. Steele, Georges Favreau, Lutz Nasdala, Steffen Möckel, Gerald Giester, Dmitry Y. Pushcharovsky
- Abstract
Bendadaite, ideally Fe2+Fe3+2(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 ( 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)(311), 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)S1.00(Fe3+1.80Al0.20)S2.00(As1.48P0.52)S2.00O8(OH)2·4H2O (R = 1.6%), and confirms an arthurite-type atomic arrangement.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- Russian Academy of Sciences, Anuchin Research Institute and Museum of Anthropology, Federal University of Minas Gerais (UFMG), Museums Victoria, University of Hamburg, Natural History Museum of Los Angeles County, University of Chicago, Naturhistorisches Museum Wien (NHM), University of São Paulo, Independent researcher, Vogtsstr. 3
- Journal
- Mineralogical Magazine
- Volume
- 74
- Pages
- 469-486
- No. of pages
- 18
- ISSN
- 0026-461X
- DOI
- https://doi.org/10.1180/minmag.2010.074.3.469
- Publication date
- 2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105113 Crystallography, 104006 Solid state chemistry, 1051 Geology, Mineralogy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/def97339-1578-42a3-b93b-9be95dfe2432