| Reference Type | Journal (article/letter/editorial) |
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| Title | Ferrostalderite, CuFe2TlAs2S6, a new mineral from Lengenbach, Switzerland: occurrence, crystal structure, and emphasis on the role of iron in sulfosalts |
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| Journal | Mineralogical Magazine |
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| Authors | Biagioni, Cristian | Author |
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| Bindi, Luca | Author |
| Nestola, Fabrizio | Author |
| Cannon, Ralph | Author |
| Roth, Philippe | Author |
| Raber, Thomas | Author |
| Year | 2016 (February) | Volume | 80 |
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| Page(s) | 175-186 | Issue | 1 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM80_175.pdf+ |
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| DOI | doi:10.1180/minmag.2015.079.7.10Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 244760 | Long-form Identifier | mindat:1:5:244760:9 |
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| GUID | 088f583c-48dc-414f-ad49-e19a5bfd0ea2 |
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| Full Reference | Biagioni, Cristian, Bindi, Luca, Nestola, Fabrizio, Cannon, Ralph, Roth, Philippe, Raber, Thomas (2016) Ferrostalderite, CuFe2TlAs2S6, a new mineral from Lengenbach, Switzerland: occurrence, crystal structure, and emphasis on the role of iron in sulfosalts. Mineralogical Magazine, 80 (1) 175-186 doi:10.1180/minmag.2015.079.7.10 |
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| Plain Text | Biagioni, Cristian, Bindi, Luca, Nestola, Fabrizio, Cannon, Ralph, Roth, Philippe, Raber, Thomas (2016) Ferrostalderite, CuFe2TlAs2S6, a new mineral from Lengenbach, Switzerland: occurrence, crystal structure, and emphasis on the role of iron in sulfosalts. Mineralogical Magazine, 80 (1) 175-186 doi:10.1180/minmag.2015.079.7.10 |
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| Abstract/Notes | The new mineral species ferrostalderite, CuFe2TlAs2S6, was discovered in the Lengenbach quarry, Binn Valley, Wallis, Switzerland. It occurs as minute, metallic, black, equant to prismatic crystals, up to 50 mu;m, associated with dolomite, realgar, baumhauerite (?) and pyrite. Minimum and maximum reflectance data for COM wavelengths in air are [λ (nm): R (%)]: 471.1: 24.2/25.4; 548.3: 23.7/24.7; 586.6: 22.9/23.8; 652.3: 21.0/22.0. Electron microprobe analyses give (wt.%): Cu 6.24(25), Ag 4.18(9), Fe 9.95(83), Zn 4.46(91), Hg 1.22(26), Tl 26.86(62), As 19.05(18), Sb 0.63(6),S 25.39(47), total 97.98(72). On the basis of 12 atoms per formula unit, the chemical formula of ferrostalderite is Cu0.75(2)Ag0.30(1)Fe1.36(10)Zn0.52(11)Hg0.05(1)Tl1.00(1)[As1.94(4)Sb0.04(1)]∑1.98(4)S6.04(4). The new mineral is tetragonal, space group I4̄2 m, with a = 9.8786(5), c = 10.8489(8) Å, V = 1058.71(11) Å3, Z = 4. The main diffraction lines of the calculated powder diagram are [d (in Å), intensity, hkl]: 4.092, 70, 211; 3.493, 23, 220; 3.396, 35, 103; 3.124, 17, 310; 2.937, 100, 222; 2.656, 19, 321; 2.470, 19, 400; 2.435, 33, 303. The crystal structure of ferrostalderite has been refined by Xray single-crystal data to a final R1= 0.050, on the basis of 1169 reflections with F0 > 4σ(F0). It shows a three dimensional framework of (Cu,Fe)-centred tetrahedra (1M1 + 2 M2), with channels parallel to [001] hosting disymmetric TlS6and (As,Sb)S3 polyhedra. Ferrostalderite is derived from its isotype stalderiteM1CuM2Zn2TlAs2S6through the homovalent substitution M2Zn2+ → M2Fe2+. The ideal crystal-chemical formula of ferrostalderite isM1CuM2Fe2TlAs2S6. |
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