IMA 2020-063 = tennantite-(Hg)

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
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IMA 2020-063 = tennantite-(Hg)

Messaggio da Marco E. Ciriotti » lun 19 lug, 2021 10:28

Prossima pubblicazione.

Referenza:
▪ Biagioni, C., Sejkora, J., Raber, T., Roth, P., Moëlo, Y., Dolníček, Z., Pasero, M. (2021): Tennantite-(Hg), Cu6(Cu4Hg2)As4S13, a new tetrahedrite group mineral from the Lengenbach quarry (Binn, Switzerland). Mineralogical Magazine, 85, (in press).

Abstract:
Tennantite-(Hg), Cu6(Cu4Hg2)As4S13, was approved as a new mineral species from the Lengenbach quarry, Imfeld, Binn Valley, Canton Valais, Switzerland. It was identified as an aggregate of black metallic tetrahedral crystals, less than 0.1 mm in size, intimately associated with sinnerite, and grown on realgar. In reflected light, tennantite-(Hg) is isotropic, grey in color, with creamy tints. Minimum and maximum reflectance data for COM wavelengths in air are [λ (nm): R (%)]: 470: 29.1; 546: 29.1; 589: 28.5; 650: 27.7. Electron microprobe analysis gave (in wt% - average of 7 spot analyses): Cu 32.57(42), Ag 6.38(19), Tl 0.29(14), Zn 0.04(5), Hg 17.94(227), Pb 0.70(51), As 17.83(61), Sb 0.34(8), S 24.10(41), total 100.19(1.04). The empirical formula of the studied sample, recalculated on the basis of ΣMe = 16 atoms per formula unit, is (Cu4.69Ag1.04Tl0.03)Σ5.76(Cu4.35Hg1.58Pb0.06Zn0.01)Σ6.00(As4.20Sb0.05)Σ4.25S13.26. Tennantite-(Hg) is cubic, I4-3m, with a = 10.455(7) Å, V = 1143(2) Å3, Z = 2. The crystal structure of tennantite-(Hg) has been refined by single-crystal X-ray diffraction data to a final R1 = 0.0897 on the basis of 214 unique reflections with Fo > 4σ(Fo) and 22 refined parameters. Tennantite-(Hg) is isotypic with other members of the tetrahedrite group. Mercury is hosted at the tetrahedrally coordinated M(1) site, in accord with the relatively long M(1)–S(1) distance (2.389 Å), similar to that observed in tetrahedrite-(Hg). Minor Ag is located at the triangularly-coordinated and split M(2) site. Other occurrences of tennantite-(Hg) are briefly reviewed and the Lengenbach finding is described within the framework of previous knowledge about the Hg mineralogy at this locality.
Marco E. Ciriotti

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

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Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2020-063 = tennantite-(Hg)

Messaggio da Marco E. Ciriotti » ven 26 nov, 2021 15:57

Pubblicazione effettuata.

Referenza:
▪ Biagioni, C., Sejkora, J., Raber, T., Roth, P., Moëlo, Y., Dolníček, Z., Pasero, M. (2021): Tennantite-(Hg), Cu6(Cu4Hg2)As4S13, a new tetrahedrite group mineral from the Lengenbach quarry (Binn, Switzerland). Mineralogical Magazine, 85, 744-751.
Marco E. Ciriotti

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

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