IMA 2014-090 = ferrostalderite

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Marco E. Ciriotti
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IMA 2014-090 = ferrostalderite

Messaggio da Marco E. Ciriotti » sab 12 dic, 2015 7:58

Prossima pubblicazione.

Referenza:
▪ Biagioni, C., Bindi, L., Nestola, F., Cannon, R., Roth, P., Raber, T. (2015): Ferrostalderite, CuFe2TlAs2S6, a new mineral from Lengenbach, Switzerland: occurrence, crystal structure, and emphasis on the role of iron in 5 sulfosalts. Mineralogical Magazine, 79, (in press).

Abstract:
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 ��m, associated with dolomite, realgar, baumhauerite (?), and pyrite. Minimum and maximum reflectance data for COM wavelengths in air are [�� (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 I42m, with a = 9.8786(5), c = 10.8489(8) Å, V = 1058.71(11) Å3, Z = 4. 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 X-ray single-crystal data to a final R1 = 0.050, on the basis of 1169 observed reflections. It shows a three dimensional framework of (Cu,Fe)-centered tetrahedra (1 M1 + 2 M2), with channels parallel to [001] hosting TlS6 and (As,Sb)S3 disymmetric polyhedra. Ferrostalderite is derived from its isotype stalderite M1CuM2Zn2TlAs2S6 through the homovalent substitution M2Zn2+��M2Fe2+. The ideal crystal-chemical formula of ferrostalderite is M1CuM2Fe2TlAs2S6.

Routhierite group
Arsiccioite Hg(Ag0.5Hg0.5)2TlAs2S6
Ferrostalderite Fe(Cu0.5Fe0.5)2TlAs2S6
Ralphcannonite Zn(Zn0.5Ag0.5)2TlAs2S
Routhierite Hg(Cu0.5Hg0.5)2TlAs2S6
Stalderite Zn(Cu0.5Zn0.5)2TlAs2S6
Marco E. Ciriotti

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