Chovanite, Pb15-2xSb14+2xS36Ox (x ∼ 0.2), a new sulphosalt species from the Low Tatra Mountains, Western Carpathians, Slovakia

Topa, Dan; Sejkora, Jiří; Makovicky, Emil; Pršek, Jaroslav; Ozdín, Daniel; Putz, Hubert; Dittrich, H.; Karup-Møller, Sven

doi:10.1127/0935-1221/2012/0024-2189

Cited by 9 publications

(19 citation statements)

References 18 publications

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“…Chalcostibite sample was found in the abandoned gallery Ludovít at the hydrothermal antimony deposit Dúbrava, which is situated on the northern slopes of the Low Tatra Mountains, Slovakia . Chalcostibite forms irregular crystals and grains up to 5 cm in length in baryte gangue, in polished sections with one perfect and one indistinct cleavage planes (Figure a).…”

Section: Methodsmentioning

confidence: 99%

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Sejkora

Buixaderas

Škácha

et al. 2018

J Raman Spectroscopy

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Micro‐Raman spectroscopy was used to investigate the natural orthorhombic members (space group Pnma) along the CuSbS2–CuSbSe2 join: chalcostibite Cu1.01Sb1.00S1.99 from Dúbrava (Slovak Republic); Se‐rich chalcostibite Cu1.00(Sb0.99As0.02)Σ1.01(S1.29Se0.70)Σ1.99 and the new mineral příbramite Cu0.99(Sb1.03As0.01)Σ1.04(Se1.82S0.15)Σ1.97 both from the Příbram uranium and base‐metal district (Czech Republic). Stretching and bending vibrations of the pyramidal SbS3 groups occur between 350 and 200 cm−1; vibrations of SbSe3 groups are shifted to the range 240–80 cm−1 due to the almost twice heavier mass of Se compared with S. The shift of the ν1 symmetric Sb‐(S,Se) vibration was observed, yielding 113 cm−1, and for the ν3 antisymmetric stretching Sb‐(S,Se), vibration was about 127 cm−1. The wavenumber of the ν1 symmetric Sb–S stretching vibrations decreases with increasing Se content—from 336 (in chalcostibite) over 330 (in Se‐rich chalcostibite) to 326 cm−1 (in příbramite), and a similar situation was observed for the case of ν1 symmetric Sb–Se stretching vibrations from 220 in Se‐rich chalcostibite to 215 cm−1 in příbramite. The trend for the ν3 antisymmetric Sb‐(S,Se) stretching vibrations is the opposite, from 306 cm−1 in chalcostibite to 314 cm−1 in Se‐rich chalcostibite (Sb–S bonds) and from 180 cm−1 in Se‐rich chalcostibite to 185 cm−1 in příbramite (Sb–Se bonds). These small shifts are probably connected with the influencing of the bonding environment of SbS3 and SbSe3 pyramids. The vibrations of Cu‐S(Se) bonds are represented only by less intense bands, and the observed intense bands below 80 cm−1 should correspond to external modes.

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Section: Methodsmentioning

confidence: 99%

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Sejkora

Buixaderas

Škácha

et al. 2018

J Raman Spectroscopy

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“…In the same veins, yellow to orange-red tetrahedral or pseudo-octahedral crystals of sphalerite, up to 1 cm and mm-sized tetrahedral crystals of tetrahedrite have been found. Energy-dispersive Moëlo et al (2008), with the exception of the recently described mineral species arsiccioite (Biagioni et al, 2014), boscardinite (Orlandi et al, 2012), chovanite (Topa et al, 2012) and protochabournéite . ''Quatrandorite'' is currently under study.…”

Section: Geological Setting and Occurrence Of Rouxelitementioning

confidence: 99%

Lead-antimony sulfosalts from Tuscany (Italy). XV. (Tl-Ag)-bearing rouxelite from Monte Arsiccio mine: occurrence and crystal chemistry

2014

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A third world occurrence of rouxelite, ideally Cu2HgPb22Sb28S64(O,S)2, has been identified from the baryte-pyrite-Fe oxides ore of Monte Arsiccio mine, near Sant’Anna di Stazzema (Apuan Alps, Tuscany, Italy). Rouxelite occurs as mm-sized acicular crystals, black in colour, with bluish-violet iridescence, in vugs of carbonate + baryte + quartz veins embedded in dolostones from the Sant’Olga tunnel. It is associated with Tl-bearing chovanite, sphalerite and valentinite. Its X-ray powder diffraction pattern gives unit-cell parameters a = 43.10(2), b = 4.060(2), c = 37.88(2) Å, β = 117.33(2)°, V = 5889(5) Å3. Electron-microprobe data reveal a complex chemistry, with additional minor elements (wt.%): Tl (0.6–1.7), Ag (0.4–0.6), As (0.2–0.6) and Bi (≤0.05). This indicates a widespread substitution of Hg by Ag, according to Hg + Pb = Ag + Sb and incorporation of Tl, with some Ag, according to 2Pb = Sb + (Tl, Ag). The occurrence of mixed (Hg, Ag) and (Hg, Cu) sites in natural sulfides and sulfosalts is briefly reviewed. The Tl-content of the samples studied is a characteristic fingerprint agreeing with the Tl-rich nature of the mineral assemblage from Monte Arsiccio. Rouxelite therefore constitutes a new example of a Tl-bearing sulfosalt.

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“…Chovanite from the Slovak locality is Tl-free [1], whereas the chovanite from the Pollone mine has 0.30 Tl apfu [2]. According to [2], in the 8 Å crystal structure of chovanite, the sites Pb13 and Pb14 In chovanite from Pollone [2], the selection of the shortest (=strongest) (Sb,As)-S bonds (≤2.70 Å), together with short (Sb,As)-O distances distinguish finite (Sb,As) m S n chain fragments within the four constitutive modules A, B, C1, and C2.…”

Section: Thallium In the Crystal Structure Of Chovanitementioning

confidence: 99%

“…Chovanite from the Slovak locality is Tl-free [1], whereas the chovanite from the Pollone mine has 0.30 Tl apfu [2]. According to [2], in the 8 Å crystal structure of chovanite, the sites Pb13 and Pb14 have the highest coordination number (IX) and were considered as the most favorable to host the large cation Tl + .…”

Section: Thallium In the Crystal Structure Of Chovanitementioning

confidence: 99%

“…Chovanite is one of the few lead-antimony oxysulfosalts found in nature and it has been reported from very few localities worldwide. Chovanite was first described from three Sb deposits in the Low Tatra Mountains, Slovakia [1] and, later, was found in two small neighboring pyrite ± baryte ± iron oxide ore deposits from the Southern Apuan Alps, i.e., the Pollone and Monte Arsiccio mines [2]. These latter findings allowed a better description of the crystal-chemistry of chovanite, whose ideal formula can be written as Pb 28 Sb 30 S 72 O.…”

Section: Introductionmentioning

confidence: 96%

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Lead–Antimony Sulfosalts from Tuscany (Italy). XXIV. Crystal Structure of Thallium-Bearing Chovanite, TlPb26(Sb,As)31S72O, from the Monte Arsiccio Mine, Apuan Alps

et al. 2018

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A thallium-bearing variety of the lead–antimony oxysulfosalt chovanite from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy) has been reexamined. It occurs as thin, ribbon-like crystals, black in color, up to 5 mm in length in vugs of dolomite ± baryte ± quartz veins embedded in the metadolostone of the Sant’Olga level. Associated minerals are rouxelite, robinsonite, sphalerite, valentinite, baryte, dolomite, quartz, and Ba-rich K-feldspar. Chemical analysis pointed to contents of Tl up to 0.86 apfu, corresponding to the ideal chemical formula TlPb26(Sb,As)31S72O. The structural role of thallium has been investigated using single-crystal X-ray diffraction using synchrotron radiation (λ = 0.59040 Å). Thallium-rich chovanite is monoclinic, space group P21/c, with unit-cell parameters a = 34.280(3), b = 8.2430(7), c = 48.457(4) Å, β = 106.290(4)°, and V = 13143(2) Å3. The crystal structure was refined to a final R1 = 0.083 for 12,052 reflections with Fo > 4σ(Fo) and 1210 refined parameters. The general features of thallium-rich chovanite agree with those of chovanite. Thallium is present as Tl+; it is disordered among two mixed (Pb/Tl) positions, with a Tl/Pb atomic ratio below 1, that precludes this compound to be a new species.

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Chovanite, Pb15-2xSb14+2xS36Ox (x ∼ 0.2), a new sulphosalt species from the Low Tatra Mountains, Western Carpathians, Slovakia

Cited by 9 publications

References 18 publications

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Lead-antimony sulfosalts from Tuscany (Italy). XV. (Tl-Ag)-bearing rouxelite from Monte Arsiccio mine: occurrence and crystal chemistry

Lead–Antimony Sulfosalts from Tuscany (Italy). XXIV. Crystal Structure of Thallium-Bearing Chovanite, TlPb26(Sb,As)31S72O, from the Monte Arsiccio Mine, Apuan Alps

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Chovanite, Pb15-2xSb14+2xS36Ox (x ∼ 0.2), a new sulphosalt species from the Low Tatra Mountains, Western Carpathians, Slovakia

Cited by 9 publications

References 18 publications

Micro‐Raman spectroscopy of natural members along CuSbS2–CuSbSe2 join

Micro‐Raman spectroscopy of natural members along CuSbS2–CuSbSe2 join

Lead-antimony sulfosalts from Tuscany (Italy). XV. (Tl-Ag)-bearing rouxelite from Monte Arsiccio mine: occurrence and crystal chemistry

Lead–Antimony Sulfosalts from Tuscany (Italy). XXIV. Crystal Structure of Thallium-Bearing Chovanite, TlPb26(Sb,As)31S72O, from the Monte Arsiccio Mine, Apuan Alps

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Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join

Micro‐Raman spectroscopy of natural members along CuSbS₂–CuSbSe₂ join