IMA 2016-044 = bytízite

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Marco E. Ciriotti
Messaggi: 24492
Iscritto il: ven 25 giu, 2004 11:31
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IMA 2016-044 = bytízite

Messaggio da Marco E. Ciriotti » mar 20 giu, 2017 12:01

Prossima pubblicazione.

Referenza:
▪ Škácha, P., Sejkora, J., Plášil, J. (2018): Bytízite, a new Cu-Sb selenide from Příbram, Czech Republic. Mineralogical Magazine, 82, (in press).

Abstract:
The new mineral bytízite was found in the dump of shaft No. 16, one of the mines in the Příbram uranium and base-metal district, central Bohemia, Czech Republic. Bytízite is associated with chaméanite, příbramite, giraudite, berzelianite, umangite, eskebornite, hakite, tetrahedrite, bukovite, crookesite and uraninite in a calcite-dominant gangue. The new mineral occurs as anhedral grains up to 40 μm, growing together in aggregates up to 300 μm across in the calcite gangue. Bytízite is steel-grey in colour and has a metallic lustre. Mohs hardness is ca. 2-3; the calculated density is 6.324 g.cm-3. In reflected light bytízite is grey with a yellowish hue, yellowish and brownish. Bireflectance and pleochroism are weak. Anisotropy is strong with grey to brownish rotation tints. Internal reflections were not observed. The empirical formula, based on electron-microprobe analyses, is (Cu3.00Fe0.01Ag0.01)3.02(Sb0.97As0.06)1.03Se2.94. The ideal formula is Cu3SbSe3, which requires Cu 34.71, Sb 22.16 and Se 43.13, total 100.00 wt.%. Bytízite is orthorhombic, Pnma, a = 7.9594(12), b = 10.5830(14), c = 6.8240(11) Å, with V = 574.82(15) Å3 and Z = 4. The strongest reflections of the calculated powder X-ray diffraction pattern [d, Å (I)(hkl)] are: 3.73(37) (210), 3.27(62) (211), 2.867(40) (022), 2.698(100) (122), 2.646(37) (040). According to the single-crystal X-ray 25 diffraction data (Robs = 0.0437), bytízite is isostructural with synthetic Cu3SbSe3. The structure of bytízite contains two Cu, one Sb, and two Se sites (last mentioned is occupied both by Se and S atoms). In the structure of both synthetic Cu3SbSe3 and bytízite, there are groups of three cis-edge-sharing tetrahedra [Cu3Se8], which are interlinked to a 3D framework by SbSe3 groups. Bytízite is named after its type locality, the Bytíz deposit, near the village Bytíz.
Marco E. Ciriotti

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

Avatar utente
Marco E. Ciriotti
Messaggi: 24492
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 2016-044 = bytízite

Messaggio da Marco E. Ciriotti » mer 18 apr, 2018 10:02

Pubblicazione effettuata.

Referenza:
▪ Škácha, P., Sejkora, J., Plášil, J. (2018): Bytízite, a new Cu-Sb selenide from Příbram, Czech Republic. Mineralogical Magazine, 82, 199-209.
Marco E. Ciriotti

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

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