MINERALOGY OF THE NIEDERSCHLEMA ALBERODA U Se POLYMETALLIC DEPOSIT, ERZGEBIRGE, GERMANY. V. WATKINSONITE, NEVSKITE, BOHDANOWICZITE AND OTHER BISMUTH MINERALS

Förster, Hans‐Jürgen; Tischendorf, G.; Rhede, Dieter

doi:10.2113/gscanmin.43.3.899

Cited by 14 publications

(9 citation statements)

References 12 publications

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“…The Zálesí uranium deposit [12][13][14][15], the Jelení vrch [12], and the Bílá Voda [16] occurrences were discovered in the Rychlebské hory Mountains. The rich association of selenides from the uranium ore district Niederschlema-Alberoda in the Saxonian part of the Krušné hory Mountains was also studied in detail [17][18][19][20][21][22][23]. Recently, selenide occurrences tied to uranium-vanadium mineralization in the Prachovice quarry [24] and those associated with minor uranium mineralization at fluorite-baryte Moldava [25] and Běstvina [26] deposits were studied.…”

Section: Introductionmentioning

confidence: 99%

Selenide Mineralization in the Příbram Uranium and Base-Metal District (Czech Republic)

2017

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Selenium mineralization in the Příbram uranium and base-metal district (Central Bohemia, Czech Republic) bound to uraninite occurrences in calcite hydrothermal veins is extremely diverse. The selenides antimonselite, athabascaite, bellidoite, berzelianite, brodtkorbite, bukovite, bytízite, cadmoselite, chaméanite, clausthalite, crookesite, dzharkenite, eskebornite, eucairite, ferroselite, giraudite, hakite, klockmannite, naumannite, permingeatite, příbramite, sabatierite, tiemannite, and umangite were found here, including two new mineral phases: Hg-Cu-Sb and Cu-As selenides. Those selenides-and in some cases their sulphidic equivalents-are characterized using wavelength-dispersive spectroscopy, reflected light, powder X-ray diffraction, single crystal X-ray diffraction, Raman spectroscopy, and electron backscatter diffraction. The selenide mineralization in the Příbram uranium district is bound to the border of the carbonate-uraninite and subsequent carbonate-sulphidic stages. Selenides crystallized there at temperatures near 100 • C in the neutral-to-weakly-alkaline environment from solutions with high oxygen fugacity and a high Se 2 /S 2 fugacity ratio.

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Section: Introductionmentioning

confidence: 99%

Selenide Mineralization in the Příbram Uranium and Base-Metal District (Czech Republic)

2017

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“…Black squares represent luxembourgite from Bivels (this paper). White squares represent watkinsoniteluxembourgite from Niederschlema (Förster et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Luxembourgite, AgCuPbBi<sub>4</sub>Se<sub>8</sub>, a new mineral species from Bivels, Grand Duchy of Luxembourg

Philippo

Hatert²,

Bruni³

et al. 2020

Eur. J. Mineral.

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Abstract. Luxembourgite, ideally AgCuPbBi4Se8, is a new selenide discovered at Bivels, Grand Duchy of Luxembourg. The mineral forms tiny fibres reaching 200 µm in length and 5 µm in diameter, which are deposited on dolomite crystals. Luxembourgite is grey, with a metallic lustre and without cleavage planes; its Mohs hardness is 3 and its calculated density is 8.00 g cm−3. Electron-microprobe analyses indicate an empirical formula Ag1.00(Cu0.82Ag0.20Fe0.01)Σ1.03Pb1.13Bi4.11(Se7.72S0.01)Σ7.73, calculated on the basis of 15 atoms per formula unit. A single-crystal structure refinement was performed to R1=0.0476, in the P21∕m space group, with a=13.002(1), b=4.1543(3), c=15.312(2) Å, β=108.92(1)∘, V=782.4(2) Å3, Z=2. The crystal structure is similar to that of litochlebite and watkinsonite and can be described as an alternation of two types of anionic layers: a pseudotetragonal layer four atoms thick and a pseudohexagonal layer that is one atom thick. In the pseudotetragonal layers the Bi1, Bi2 ,Bi3, Pb, and Ag1 atoms are localised, while the Cu2 and Bi4 atoms occur between the pseudotetragonal and the pseudohexagonal layers. Bi1, Bi2, and Bi3 atoms occur in weakly distorted octahedral sites, whereas Bi4 occurs in a distorted 7-coordinated site. Ag1 occupies a fairly regular octahedral site, Cu2 a tetrahedral position, and Pb occurs on a very distorted 8-coordinated site.

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“…As already mentioned, litochlebite is an Ag-dominant and S-free analogue of watkinsonite Cu 2 PbBi 4 Se 8 (Johan et al 1987, Förster et al 2005, Topa et al 2010a and is structurally related to berryite (Topa et al 2006, compare Figs. 4 and6 in Topa et al 2010a).…”

Section: Relations To Other Sulfosaltsmentioning

confidence: 93%

“…Litochlebite from Zálesí is a Se-dominant and virtually S-free mineral (S contents of only up to 0.02 apfu); similar low sulfur contents were deter-mined for watkinsonite from Zálesí (Topa et al 2010a, Sejkora et al, in prep. ) and Niederschlema-Alberoda (Förster et al 2005). In contrast, Johan et al (1987) reported S contents in the range 1.62-1.82 apfu in watkinsonite from the Otish Mountains.…”

Section: Chemical Compositionmentioning

confidence: 94%

LITOCHLEBITE, Ag2PbBi4Se8, A NEW SELENIDE MINERAL SPECIES FROM ZALESI, CZECH REPUBLIC: DESCRIPTION AND CRYSTAL STRUCTURE

Sejkora

Makovicky

Topa

et al. 2011

The Canadian Mineralogist

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Litochlebite, Ag 2 PbBi 4 Se 8 , is a new selenide mineral from the Zálesí uranium deposit, Rychlebské hory Mountains, northern Moravia, Czech Republic. It occurs as irregular grains up to 200 mm, which form aggregates up to 1-2 mm in size in a quartz gangue. These aggregates are replaced along the margins and fractures by a heterogeneous supergene Bi-Se-O phase. Other associated minerals included uraninite, hematite, and uranophane. Litochlebite is opaque, dark grey to black, has a dark grey streak and a metallic luster. No cleavage was observed; the mineral is brittle with an irregular fracture. The VHN 10g microhardness 230 (227-234) kg/mm 2 corresponds to a Mohs hardness of about 3; the calculated density is 7.90 g/cm 3 . In reflected light, litochlebite is white, with weak bireflectance (only in oil) and pleochroism from white with a very faint yellowish tint to white with a very faint bluish tint. Between crossed polars, the anisotropy is moderate both in air and in oil, with dark grey to brown polarization-colors. Reflectance values in air (R min , R max in %, l nm) are: 44.5-49.9 (470), 45.1-50.5 (546), 45.6-51.3 (589), 45.4-51.8 (650). Litochlebite is monoclinic, space group P2 1 /m, with a 13.182(2), b 4.1840(8), c 15.299(2) Å, b 109.11(1)°, V 797.3(2) Å 3 , and a:b:c 3.1506:1:3.6565. The main lines of the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are: 3.684(53) (301), 3.201(76)(104), 3.028(100)(311), 2.980 (88)(312) and 2.892(95)(005). Its average composition (electron-microprobe data) is Cu 0.10, Ag 10.27, Cd 0.05, Pb 11.73, Bi 43.27, Se 32.93, S 0.01, total 98.36 wt.%. The resulting empirical formula, written on the basis 15 apfu, is (Ag 1.100.00 wt.%. The crystal structure of litochlebite has been solved by direct methods and refined to R 1 = 3.89% on the basis of 938 unique reflections [F o > 4s(F o )] collected on a Bruker AXS diffractometer with a CCD detector and MoKa radiation. The crystal structure contains one lead site, four independent Bi sites, four silver sites and eight independent Se sites. One Ag site is an octahedrally coordinated (2 + 4) site in the pseudotetragonal layer, the other Ag site has a distorted tetrahedral coordination. The remaining Ag sites have low occupancies. Litochlebite is an Ag-dominant isotype of watkinsonite, Cu 2 PbBi 4 Se 8 , and structurally related to berryite, Cu 3 Ag 2 Pb 3 Bi 7 S 16 . SOmmAiRELa litochlebite, Ag 2 PbBi 4 Se 8 , est une nouvelle espèce de séléniure découverte à Zálesí, gisement d'uranium situé dans les montagnes Rychlebské hory du nord de la Moravie, en République Tchèque. Elle se présente en grains irréguliers atteignant 200 mm en agrégats de 1 à 2 mm englobés dans le quartz. Ces agrégats sont remplacés le long des bordures et des fractures par une phase hétérogène supergène contenant Bi-Se-O. Lui sont ssociés uraninite, hématite, et uranophane. La litochlebite est opaque, §

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MINERALOGY OF THE NIEDERSCHLEMA ALBERODA U Se POLYMETALLIC DEPOSIT, ERZGEBIRGE, GERMANY. V. WATKINSONITE, NEVSKITE, BOHDANOWICZITE AND OTHER BISMUTH MINERALS

Cited by 14 publications

References 12 publications

Selenide Mineralization in the Příbram Uranium and Base-Metal District (Czech Republic)

Selenide Mineralization in the Příbram Uranium and Base-Metal District (Czech Republic)

Luxembourgite, AgCuPbBi<sub>4</sub>Se<sub>8</sub>, a new mineral species from Bivels, Grand Duchy of Luxembourg

LITOCHLEBITE, Ag2PbBi4Se8, A NEW SELENIDE MINERAL SPECIES FROM ZALESI, CZECH REPUBLIC: DESCRIPTION AND CRYSTAL STRUCTURE

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MINERALOGY OF THE NIEDERSCHLEMA ALBERODA U Se POLYMETALLIC DEPOSIT, ERZGEBIRGE, GERMANY. V. WATKINSONITE, NEVSKITE, BOHDANOWICZITE AND OTHER BISMUTH MINERALS

Cited by 14 publications

References 12 publications

Selenide Mineralization in the Příbram Uranium and Base-Metal District (Czech Republic)

Selenide Mineralization in the Příbram Uranium and Base-Metal District (Czech Republic)

Luxembourgite, AgCuPbBi&lt;sub&gt;4&lt;/sub&gt;Se&lt;sub&gt;8&lt;/sub&gt;, a new mineral species from Bivels, Grand Duchy of Luxembourg

LITOCHLEBITE, Ag2PbBi4Se8, A NEW SELENIDE MINERAL SPECIES FROM ZALESI, CZECH REPUBLIC: DESCRIPTION AND CRYSTAL STRUCTURE

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Luxembourgite, AgCuPbBi<sub>4</sub>Se<sub>8</sub>, a new mineral species from Bivels, Grand Duchy of Luxembourg