| Reference Type | Journal (article/letter/editorial) |
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| Title | Bendadaite, a new iron arsenate mineral of the arthurite group |
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| Journal | Mineralogical Magazine |
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| Authors | Kolitsch, U. | Author |
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| Atencio, D. | Author |
| Chukanov, N. V. | Author |
| Zubkova, N. V. | Author |
| Menezes Filho, L. A. D. | Author |
| Coutinho, J. M. V. | Author |
| Birch, W. D. | Author |
| Schlüter, J. | Author |
| Pohl, D. | Author |
| Kampf, A. R. | Author |
| Steele, I. M. | Author |
| Favreau, G. | Author |
| Nasdala, L. | Author |
| Möckel, S. | Author |
| Giester, G. | Author |
| Pushcharovsky, D. Yu. | Author |
| Year | 2010 (June) | Volume | 74 |
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| Page(s) | 469-486 | Issue | 3 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM74_469.pdf+ |
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| DOI | doi:10.1180/minmag.2010.074.3.469Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244080 | Long-form Identifier | mindat:1:5:244080:8 |
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| GUID | d772c644-0a77-4fdd-af43-9b8e1fdec6e7 |
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| Full Reference | Kolitsch, U., Atencio, D., Chukanov, N. V., Zubkova, N. V., Menezes Filho, L. A. D., Coutinho, J. M. V., Birch, W. D., Schlüter, J., Pohl, D., Kampf, A. R., Steele, I. M., Favreau, G., Nasdala, L., Möckel, S., Giester, G., Pushcharovsky, D. Yu. (2010) Bendadaite, a new iron arsenate mineral of the arthurite group. Mineralogical Magazine, 74 (3) 469-486 doi:10.1180/minmag.2010.074.3.469 |
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| Plain Text | Kolitsch, U., Atencio, D., Chukanov, N. V., Zubkova, N. V., Menezes Filho, L. A. D., Coutinho, J. M. V., Birch, W. D., Schlüter, J., Pohl, D., Kampf, A. R., Steele, I. M., Favreau, G., Nasdala, L., Möckel, S., Giester, G., Pushcharovsky, D. Yu. (2010) Bendadaite, a new iron arsenate mineral of the arthurite group. Mineralogical Magazine, 74 (3) 469-486 doi:10.1180/minmag.2010.074.3.469 |
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| Abstract/Notes | 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. |
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