IMA 2016-050 = omariniite

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
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IMA 2016-050 = omariniite

Messaggio da Marco E. Ciriotti » mar 22 nov, 2016 10:23

Prossima pubblicazione.

Referenza:
▪ Bindi, L., Putz, H., Parr, W.H., Stanley, C.J. (2017): Omariniite, Cu8Fe2ZnGe2S12, the germanium-analogue of stannoidite, a new mineral species from Capillitas, Argentina. Mineralogical Magazine, 81, (in press).

Abstract:
Omariniite, ideally Cu8Fe2ZnGe2S12, represents the Ge-analogue of stannoidite and was found in bornite-chalcocite-rich ores near the La Rosario vein of the Capillitas epithermal deposit, Catamarca Province, Argentina. The mineral is closely associated with three other Ge-bearing minerals (putzite, catamarcaite, rarely zincobriartite) and bornite, chalcocite, digenite, covellite, sphalerite, tennantite, luzonite, wittichenite, thalcusite and traces of mawsonite. The width of the seams rarely exceeds 60 μm, their length can attain several 100 μm’s. The mineral is opaque, orange-brown in polished section, has a metallic luster and a brownish-black streak. It is brittle, and the fracture is irregular to subconchoidal. Neither cleavage nor parting are observable in the sections. In plane-polarized light omariniite is brownish-orange and has a weak pleochroism. Internal reflections are absent. The mineral is distinctly anisotropic with rotation tints varying between brownish-orange and greenish-brown. The average result 34 of 45 electron-microprobe analyses is Cu 42.18(34), Fe 9.37(26), Zn 5.17(43), In 0.20(6), Ge 11.62(22), S 31.80(20), total 100.34(46) wt%. The empirical formula, based on Σ(Me+S) = 25, is Cu8.04(Fe2.03In0.02)Σ2.05Zn0.96Ge1.94S12.01, ideally Cu+ 8Fe3+ 2Zn2+Ge4+ 2S2-12. Omariniite is orthorhombic, space group I222, with unit-cell parameters: a = 10.774(1), b = 5.3921(5), c = 16.085(2) Å, V = 934.5(2) Å3, a:b:c = 1.9981:1:2.9831, Z = 2. X-ray single-crystal studies (R1 = 0.023) revealed the structure to be a sphalerite derivative identical to that of stannoidite. Omariniite is named after Dr. Ricardo Héctor Omarini (1946–2015), Professor at the University of Salta, for his numerous contributions to the geology of Argentina.

N.d.R.: Cu+6Cu2+2Fe2ZnGe2S12.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

Avatar utente
Marco E. Ciriotti
Messaggi: 23479
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2016-050 = omariniite

Messaggio da Marco E. Ciriotti » lun 16 ott, 2017 12:35

Pubblicazione effettuata.

Referenza:
▪ Bindi, L., Putz, H., Parr, W.H., Stanley, C.J. (2017): Omariniite, Cu8Fe2ZnGe2S12, the germanium-analogue of stannoidite, a new mineral species from Capillitas, Argentina. Mineralogical Magazine, 81, 1151-1159.

Abstract:
Omariniite, ideally Cu8Fe2ZnGe2S12, represents the Ge-analogue of stannoidite and was found in bornite-chalcocite-rich ores near the La Rosario vein of the Capillitas epithermal deposit, Catamarca Province, Argentina. The mineral is closely associated with three other Ge-bearing minerals (putzite, catamarcaite, rarely zincobriartite) and bornite, chalcocite, digenite, covellite, sphalerite, tennantite, luzonite, wittichenite, thalcusite and traces of mawsonite. The width of the seams rarely exceeds 60 μm, their length can attain several 100 μm’s. The mineral is opaque, orange-brown in polished section, has a metallic luster and a brownish-black streak. It is brittle, and the fracture is irregular to subconchoidal. Neither cleavage nor parting are observable in the sections. In plane-polarized light omariniite is brownish-orange and has a weak pleochroism. Internal reflections are absent. The mineral is distinctly anisotropic with rotation tints varying between brownish-orange and greenish-brown. The average result 34 of 45 electron-microprobe analyses is Cu 42.18(34), Fe 9.37(26), Zn 5.17(43), In 0.20(6), Ge 11.62(22), S 31.80(20), total 100.34(46) wt%. The empirical formula, based on Σ(Me+S) = 25, is Cu8.04(Fe2.03In0.02)Σ2.05Zn0.96Ge1.94S12.01, ideally Cu+ 8Fe3+ 2Zn2+Ge4+ 2S2-12. Omariniite is orthorhombic, space group I222, with unit-cell parameters: a = 10.774(1), b = 5.3921(5), c = 16.085(2) Å, V = 934.5(2) Å3, a:b:c = 1.9981:1:2.9831, Z = 2. X-ray single-crystal studies (R1 = 0.023) revealed the structure to be a sphalerite derivative identical to that of stannoidite. Omariniite is named after Dr. Ricardo Héctor Omarini (1946–2015), Professor at the University of Salta, for his numerous contributions to the geology of Argentina.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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