IMA 2016-097 = hyršlite

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Marco E. Ciriotti
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IMA 2016-097 = hyršlite

Messaggio da Marco E. Ciriotti » lun 11 giu, 2018 12:01

Prossima pubblicazione.

Referenza:
▪ Keutsch, F., Topa, D., Makovicky, E. (2018): Hyršlite, Pb8As10Sb6S32, a new N = 3;3 member of the sartorite homologous series from the Uchucchacua polymetallic deposit, Peru. European Journal of Mineralogy, 30, (in press).
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: 24698
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2016-097 = hyršlite

Messaggio da Marco E. Ciriotti » mar 04 set, 2018 17:24

Referenza:
▪ Keutsch, F., Topa, D., Makovicky, E. (2018): Hyršlite, Pb8As10Sb6S32, a new N = 3;3 member of the sartorite homologous series from the Uchucchacua polymetallic deposit, Peru. European Journal of Mineralogy, 30, (in press).

Abstract:
Hyršlite, Pb8As10Sb6S32, is a new member of the sartorite homologous series of Pb–(As,Sb) sulfosalts. It occurs in the Uchucchacua polymetallic deposit, Oyon district, Catajambo, Lima Department, Peru. Compositionally it lies between guettardite and twinnite on the one hand, and hendekasartorite on the other hand. Hyrsšlite is grey, opaque with metallic lustre. It is brittle, without observable cleavage or parting. Mohs hardness is derived as 4, based on VHN25 range of microhardness (202–221, mean 215 kg mm-2). Density (calc.) = 5.26 g cm-3 using a simplified chemical formula. Reflectance percentages (Rmin and Rmax) for the four standard COM wavelengths are 32.6, 39.0 (470 nm), 32.1, 38.5 (546 nm), 31.5, 37.9 (589 nm), and 30.7, 36.7 (650 nm), respectively. The formula based on 32 S atoms per formula unit (apfu) is Pb7.90Sb5.98As10.00S32. The unit cell of hyršlite was refined from single-crystal data, with monoclinic symmetry, space group P21 a = 8.475(3) Å, b = 7.917(3) Å, c = 20.039(8) Å, β = 102.070(6)°, V = 1314.8(9) Å3. The crystal structure of hyršlite contains 12 independent cation and 16 distinct sulfur sites. There are four fully occupied Pb sites, two fully occupied As sites, one Sb site and five mixed (As,Sb) sites. In projection parallel to the 8.5 Å axis, the crystal structure is a typical member of the sartorite homologous series, a sartorite homologue N = 3;3, and homeotype of twinnite and guettardite. Opposing surfaces of the tightly bonded double-layer in the (As,Sb)-rich slabs of the structure have different cation configurations – one resembles coordinations observed in guettardite but the opposite one, with (As,Sb) cation pairs and single polyhedra, appears unique among sartorite homologues.
Marco E. Ciriotti

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