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Pribramite, CuSbSe (sub 2) , the Se-analogue of chalcostibite, a new mineral from Pribram, Czech Republic

Pavel Skacha, Jiri Sejkora and Jakub Plasil
Pribramite, CuSbSe (sub 2) , the Se-analogue of chalcostibite, a new mineral from Pribram, Czech Republic
European Journal of Mineralogy (June 2017) 29 (4): 653-661

Abstract

The new mineral pribramite was found on the dump of shaft No. 16, one of the mines in the Pribram uranium and base-metal district, central Bohemia, Czech Republic. Pribramite is associated with antimonselite, permingeatite, dzharkenite, feroselite, hakite, tetrahedrite, chameanite, giraudite, a new Hg-, Sb-, Cu selenide, a new Sb-, Cu selenide and uraninite in a calcite-dominant gangue. The new mineral occurs as columnar crystals up to 60 X 12 mu m (in the section), growing together in aggregates up to 150 mu m across in the calcite gangue. Pribramite crystals form intergrowths and replace older permingeatite; antimonselite crystals were observed in close association as well. Pribramite is brittle, is lead grey in colour, and has a metallic lustre. Mohs hardness is ca 3-4; the calculated density is 5.884 g cm (super -3) In reflected light pribramite is grey with a yellowish hue, bireflectance is medium, and pleochroism is weak with grey tints. Anisotropy is strong with grey to brownish rotation tints. Internal reflections were not observed. The empirical formula, based on electron-microprobe analyses, is Cu (sub 1.00) (Sb (sub 1.02) As (sub 0.01) ) (sub 1.03) (Se (sub 1.81) S (sub 0.15) ) (sub 1.96) . The ideal formula is CuSbSe (sub 2) , which requires Cu 18.52, Sb 35.47 and Se 46.01, total 100.00 wt%. Additional elements as Fe, Pb, Tl and Hg were found in small concentrations above detection limits. Pribramite is orthorhombic, Pnma, a = 6.3042(15), b = 3.980(1), c = 14.989(4) A, with V = 376.09(2) A (super 3) and Z = 4. The strongest reflections of the calculated powder X-ray diffraction pattern [d, A (I)(h k l)] are: 3.152(40) (2 0 0), 3.113(100)(0 1 3), 3.085(40)(2 0 1), 3.395(63)(0 1 5), 1.9900(38)(0 2 0), 1.8442(42)(3 1 1) and 1.8329(33)(3 0 4). According to single-crystal X-ray diffraction data (R (sub obs) = 0.0480), pribramite is unequivocally isostructural with chalcostibite and emplectite. The structure of pribramite contains one Cu, one Sb and two Se sites (last mentioned is occupied both by Se and S atoms). It is built up from square Sb pyramids linked to form chains of SbSe (sub 2) along b and CuSe (sub 4) tetrahedra forming chains of CuSe (sub 3) parallel to b. These two types of infinite chains are then linked to form sheets that are stacked perpendicular to c. The effect of the larger Se atom, compared with S, is well reflected by the increased unit-cell volume of pribramite (V (sub pribramite) approximately 380 A (super 3) ) compared with that of chalcostibite (V (sub chalcostibite) approximately 330 A (super 3) ). Pribramite is named after the type locality, the Pribram uranium and base-metal district.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 29
Serial Issue: 4
Title: Pribramite, CuSbSe (sub 2) , the Se-analogue of chalcostibite, a new mineral from Pribram, Czech Republic
Affiliation: Mining Muzeum Pribram, Pribram, Czech Republic
Pages: 653-661
Published: 20170608
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 39
Accession Number: 2017-082581
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 tables, geol. sketch map
N49°40'60" - N49°40'60", E14°04'00" - E14°04'00"
Secondary Affiliation: National Museum, Department of Mineralogy and Petrology, CZE, Czech RepublicCzech Academy of Sciences, Institute of Physics, CZE, Czech Republic
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201743
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