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  • 1
    Online Resource
    Online Resource
    Rare earth elements and yttrium geochemistry of dolomite from post-Variscan vein-type mineralization of the Nízký Jeseník and Upper Silesian Basins, Czech Republic
    Elsevier BV ; 2009
    In:  Journal of Geochemical Exploration Vol. 103, No. 2-3 ( 2009-11), p. 69-79
    Details
    In: Journal of Geochemical Exploration, Elsevier BV, Vol. 103, No. 2-3 ( 2009-11), p. 69-79
    Type of Medium: Online Resource
    ISSN: 0375-6742
    URL: Article
    DOI: 10.1016/j.gexplo.2009.08.001
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2009
    detail.hit.zdb_id: 1494778-X
    SSG: 13
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  • 2
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    Stibiogoldfieldite, Cu 12 (Sb 2 Te 2 )S 13 , a new tetrahedrite-group mineral
    Mineralogical Society ; 2022
    In:  Mineralogical Magazine Vol. 86, No. 1 ( 2022-02), p. 168-175
    Details
    In: Mineralogical Magazine, Mineralogical Society, Vol. 86, No. 1 ( 2022-02), p. 168-175
    Abstract: Stibiogoldfieldite, Cu 12 (Sb 2 Te 2 )S 13 , was approved as a new mineral species from the Mohawk mine, Goldfield mining district, Esmeralda County, Nevada, USA. It occurs as metallic anhedral grains, dark grey in colour. It is associated with quartz, pyrite and an Ag–Bi–(S,Se) phase (holotype material) and with quartz, pyrite, calaverite, bismuthinite, bohdanowiczite, and the Ag–Bi–(S,Se) phase (cotype material). In reflected light, stibiogoldfieldite is isotropic, grey in colour, with indistinct brownish shade. Reflectance data in air [ R (%)] are: 31.1 at 470 nm, 30.9 at 546 nm, 30.8 at 589 nm and 31.0 at 650 nm. Electron microprobe analysis for holotype material gave (in wt.% – average of 60 spot analyses): Cu 45.03(60), Ag 0.26(7), Fe 0.02(3), Zn 0.13(15), Sn 0.02(4), Pb 0.05(6), Sb 8.02(62), As 2.80(65), Bi 2.77(87), Te 15.15(1.24), S 24.50(32), Se 0.52(11), total 99.27(69). On the basis of (As + Sb + Te + Bi) = 4 atoms per formula unit (apfu), the empirical formula of stibiogoldfieldite is (Cu 12.05 Ag 0.04 Zn 0.03 Fe 0.01 ) Σ12.13 (Sb 1.12 As 0.63 Bi 0.23 Te 2.02 ) Σ4.00 (S 12.99 Se 0.11 ) Σ13.10 . Chemical data on an additional sample from the same locality (cotype material) gave the following results (in wt.% – average of 181 spot analyses): Cu 43.84(63), Ag 0.21(7), Sb 5.92(78), As 2.63(45), Te 20.07(1.19), S 25.13(53), Se 0.97(35), total 99.47(66). On the basis of (As + Sb + Te + Bi) = 4 apfu, the empirical formula of cotype material is (Cu 11.30 Ag 0.03 ) Σ11.33 (Sb 0.80 As 0.57 Bi 0.06 Te 2.57 ) Σ4.00 (S 12.83 Se 0.20 ) Σ13.03 . Stibiogoldfieldite is cubic, I $\overline 4$ 3 m , with unit-cell parameters a = 10.3466(17) Å, V = 1107.6(5) Å 3 and Z = 2 (holotype). Unit-cell parameters for the cotype sample are a = 10.3035(2) Å and V = 1093.83(7) Å 3 . The crystal structure of holotype stibiogoldfieldite was refined by single-crystal X-ray diffraction data to a final R 1 = 0.032 on the basis of 285 reflections with F o 〉 4σ( F o ) and 20 refined parameters. Stibiogoldfieldite is isotypic with other members of the tetrahedrite group.
    Type of Medium: Online Resource
    ISSN: 0026-461X , 1471-8022
    URL: Article
    DOI: 10.1180/mgm.2021.107
    RVK:
    TE 1000
    Language: English
    Publisher: Mineralogical Society
    Publication Date: 2022
    detail.hit.zdb_id: 2034522-7
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  • 3
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    Online Resource
    Origin of the Zálesí U–Ni–Co–As–Ag/Bi deposit, Bohemian Massif, Czech Republic: fluid inclusion and stable isotope constraints
    Springer Science and Business Media LLC ; 2009
    In:  Mineralium Deposita Vol. 44, No. 1 ( 2009-1), p. 81-97
    Details
    In: Mineralium Deposita, Springer Science and Business Media LLC, Vol. 44, No. 1 ( 2009-1), p. 81-97
    Type of Medium: Online Resource
    ISSN: 0026-4598 , 1432-1866
    URL: Article
    DOI: 10.1007/s00126-008-0202-6
    RVK:
    TE 1000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2009
    detail.hit.zdb_id: 1462046-7
    detail.hit.zdb_id: 1679-2
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  • 4
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    Mineralogical and Fluid Inclusion Evidence for Reworking of Au Mineralization by Ag-Sb-Base Metal-Rich Fluids from the Bytíz Deposit, Příbram Uranium and Base-Metal Ore District, Czech Republic
    MDPI AG ; 2022
    In:  Minerals Vol. 12, No. 12 ( 2022-11-29), p. 1539-
    Details
    In: Minerals, MDPI AG, Vol. 12, No. 12 ( 2022-11-29), p. 1539-
    Abstract: This mineralogical and fluid inclusion study was conducted on an Au-bearing quartz–sulfide vein encountered in the deep parts of the Bytíz deposit in the Příbram uranium and base-metal district, Bohemian Massif, Czech Republic. The samples were taken where the Au-bearing vein is crosscut by the common base-metal Zn-Pb ore vein Bt23C. The early mineralization of the Au-bearing vein is composed mainly of quartz (Q-1 to Q-3), illite–muscovite, Fe-Mg chlorite, arsenopyrite, and Au-Ag alloys, showing a wide range of compositions (4–69 at. % Ag) and a decrease in Au/(Au + Ag) ratios during vein evolution. Younger hydrothermal processes led to the crystallization of nests and veinlets composed of late quartz (Q-4), carbonates (siderite, dolomite–ankerite and calcite), base-metal sulfides (galena, sphalerite, chalcopyrite, and tetrahedrite), a suite of Ag and Bi-tellurides, and acanthite. The input of Sb is manifested by the partial to complete replacement of some gold grains by aurostibite and an unnamed (Ag,Au)-Sb oxide with a composition close to AuSbO3. The fluid inclusion study, combined with chlorite thermometry and arsenopyrite thermometry, showed that the early mineralization crystallized from progressively cooled (from 300 to 400 °C down to ca. 180 °C), diluted (1.2–7.0 wt. % NaCl eq.) aqueous solutions. The late portion of the mineralization formed from aqueous fluids with highly variable salinity (0.2–23.4 wt. % NaCl eq.) and homogenization temperatures decreasing from ca. 250 °C to 〈 50 °C, which compare well with the base-metal mineralization of the vein Bt23C and other base-metal veins of the Příbram ore area. Our study illustrates the nature and intensity of the processes of the reworking of the early gold mineralization mediated by the younger Ag,Sb-rich base-metal fluids, giving rise to Příbram’s typical late-Variscan vein Zn-Pb mineralization.
    Type of Medium: Online Resource
    ISSN: 2075-163X
    URL: Article
    DOI: 10.3390/min12121539
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
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  • 5
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    Selenium-Rich Ag–Au Mineralization at the Kremnica Au–Ag Epithermal Deposit, Slovak Republic
    MDPI AG ; 2018
    In:  Minerals Vol. 8, No. 12 ( 2018-12-04), p. 572-
    Details
    In: Minerals, MDPI AG, Vol. 8, No. 12 ( 2018-12-04), p. 572-
    Abstract: Selenium-rich Au–Ag mineralization has been discovered in the Kremnica ore district, central Slovakia. The mineralization is hosted by a single quartz–dolomite vein hosted by Neogene propyllitized andesites of the Kremnica stratovolcano. Ore mineralogy and crystal chemistry of individual ore minerals have been studied here. The early base-metal ore mineralization composed of pyrite, sphalerite, and chalcopyrite lacks selenium, whereas the superimposed Au–Ag paragenesis is Se-enriched. The Au–Ag alloys, uytenbogaardtite, minerals of the galena–clausthalite series, acanthite–naumannite series, diaphorite, miargyrite, pyrargyrite–proustite, polybasite group, minerals of the tetrahedrite group and andorite branch (andorite IV, andorite VI, Ag-excess fizélyite), freieslebenite, and rare Pb–Sb sulphosalts (scaiinite, robinsonite, plagionite) have been identified here. Besides selenides, the most Se-enriched phases are miargyrite, proustite–pyrargyrite, and polybasite–pearceite, whose Se contents are among the highest reported worldwide. In addition, one new phase has been found, corresponding to a Se-analogue of pearceite containing 2.08–3.54 apfu Se. The style of mineralization, paragenetic situation, and chemical trends observed in individual minerals are comparable to those of Au–Ag low-sulphidation epithermal Au–Ag mineralizations of the Kremnica and neighboring Štiavnica and Hodruša-Hámre ore districts. However, the pronounced enrichment in selenium is a specific feature of the studied vein only.
    Type of Medium: Online Resource
    ISSN: 2075-163X
    URL: Article
    DOI: 10.3390/min8120572
    Language: English
    Publisher: MDPI AG
    Publication Date: 2018
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  • 6
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    Uraninite, Coffinite and Ningyoite from Vein-Type Uranium Deposits of the Bohemian Massif (Central European Variscan Belt)
    MDPI AG ; 2019
    In:  Minerals Vol. 9, No. 2 ( 2019-02-19), p. 123-
    Details
    In: Minerals, MDPI AG, Vol. 9, No. 2 ( 2019-02-19), p. 123-
    Abstract: Uraninite-coffinite vein-type mineralisation with significant predominance of uraninite over coffinite occurs in the Příbram, Jáchymov and Horní Slavkov ore districts and the Potůčky, Zálesí and Předbořice uranium deposits. These uranium deposits are hosted by faults that are mostly developed in low- to high-grade metamorphic rocks of the basement of the Bohemian Massif. Textural features and the chemical composition of uraninite, coffinite and ningyoite were studied using an electron microprobe. Collomorphic uraninite was the only primary uranium mineral in all deposits studied. The uraninites contained variable and elevated concentrations of PbO (1.5 wt %–5.4 wt %), CaO (0.7 wt %–8.3 wt %), and SiO2 (up to 10.0 wt %), whereas the contents of Th, Zr, REE and Y were usually below the detection limits of the electron microprobe. Coffinite usually forms by gradual coffinitization of uraninite in ore deposits and the concentration of CaO was lower than that in uraninites, varying from 0.6 wt % to 6.5 wt %. Coffinite from the Jáchymov ore district was partly enriched in Zr (up to 3.3 wt % ZrO2) and Y (up to 5.5 wt % Y2O3), and from the Potůčky uranium deposit, was distinctly enriched in P (up to 8.8 wt % P2O5), occurring in association with ningyoite. The chemical composition of ningyoite was similar to that from type locality; however, ningyoite from Potůčky was distinctly enriched in REE, containing up to 22.3 wt % REE2O3.
    Type of Medium: Online Resource
    ISSN: 2075-163X
    URL: Article
    DOI: 10.3390/min9020123
    Language: English
    Publisher: MDPI AG
    Publication Date: 2019
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  • 7
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    Batoniite, [Al 8 (OH) 14 (H 2 O) 18 ](SO 4 ) 5   ⋅  5H 2 O, a new mineral with the [Al 8 (OH) 14 (H 2 O) 18 ] 10+ polyoxocation from the Cetine di Cotorniano Mine, Tuscany, Italy
    Copernicus GmbH ; 2023
    In:  European Journal of Mineralogy Vol. 35, No. 5 ( 2023-08-31), p. 703-714
    Details
    In: European Journal of Mineralogy, Copernicus GmbH, Vol. 35, No. 5 ( 2023-08-31), p. 703-714
    Abstract: Abstract. The new mineral batoniite, [Al8(OH)14(H2O)18](SO4)5 ⋅ 5H2O, was discovered in the Cetine di Cotorniano Mine, Chiusdino, Siena, Tuscany, Italy. It occurs as hemispherical aggregates composed of brittle tabular crystals, up to 1 mm in size, white to colorless in color, with a white streak and a vitreous to greasy luster. Batoniite is biaxial negative, with α= 1.4833(6), β= 1.4948(6), γ= 1.5019(5) (589 nm), and 2V(meas.)= 71(1)∘. Electron microprobe analysis, affected by the dehydration of batoniite under the chamber vacuum, gave (in wt %) the following: Al2O3 33.48, Fe2O3 0.05, SO3 33.00, and H2Ocalc 44.41, total 110.94. It corresponds to the chemical formula (Al7.98Fe0.013+)Σ7.99(SO4)5.01(OH)13.95(H2O)18 ⋅ 5H2O. Batoniite is triclinic, belonging to space group P1‾, with a= 9.1757(6), b= 12.0886(9), c= 20.9218(15) Å, α= 82.901(3), β= 87.334(3), γ= 86.999(2)∘, V= 2297.8(3) Å3, and Z= 2. The crystal structure was refined to R1= 0.0916 for 8118 unique reflections with Fo〉4σ(Fo) and 811 refined parameters and 60 restraints. Batoniite is characterized by isolated [Al8(OH)14(H2O)18]10+ polyoxocations, H-bonded to five interstitial (SO4)2− and five H2O groups. In type material, it is associated with gypsum and a poorly crystallized Al–Fe sulfate. The crystallization of batoniite is probably due to the action of H2SO4 on Al-bearing rocks of Paleozoic age cropping out in the Garibaldi Tunnel, the lowest mining level of the Cetine di Cotorniano Mine.
    Type of Medium: Online Resource
    ISSN: 1617-4011
    URL: Article
    URL: Article
    DOI: 10.5194/ejm-35-703-2023
    DOI: 10.5194/ejm-35-703-2023-supplement
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2023
    detail.hit.zdb_id: 1000286-8
    detail.hit.zdb_id: 2039451-2
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  • 8
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    Grimmite, NiCo〈sub〉2〈/sub〉S〈sub〉4〈/sub〉, a new thiospinel from Příbram, Czech Republic
    Copernicus GmbH ; 2021
    In:  European Journal of Mineralogy Vol. 33, No. 2 ( 2021-04-19), p. 175-187
    Details
    In: European Journal of Mineralogy, Copernicus GmbH, Vol. 33, No. 2 ( 2021-04-19), p. 175-187
    Abstract: Abstract. The new mineral grimmite, NiCo2S4, was found in siderite–sphalerite gangue at the dump of shaft no. 9, one of the mines in the abandoned Příbram uranium and base-metal district, central Bohemia, Czech Republic. The new mineral occurs as rare idiomorphic to hypidiomorphic grains up to 200  µm × 70 µm in size or veinlet aggregates. In reflected light, grimmite is creamy grey with a pinkish tint. Pleochroism, polarising colours and internal reflections were not observed. Reflectance values of grimmite in the air (R %) are 42.5 at 470 nm, 45.9 at 546 nm, 47.7 at 589 nm and 50.2 at 650 nm). The empirical formula for grimmite, based on electron-microprobe analyses (n= 13), is Ni1.01(Co1.99Fe0.06Pb0.01Bi0.01)Σ2.07S3.92. The ideal formula is NiCo2S4; requires Ni 19.26, Co 38.67, and S 42.07; and totals 100.00 wt %. According to the single-crystal X-ray diffraction data (Robs=0.0489), grimmite is cubic, Fd–3m, a=9.3933(9), with V=828.81(14) Å3 and Z=8. The calculated density is 4.96 g cm−3. The strongest reflections of the calculated powder X-ray diffraction pattern [d, Å (I)(hkl)] are 3.3210 (75) (220), 2.7116 (7) (222), 2.3483 (81) (400), 1.9174 (27) (422), 1.6605 (100) (440), 1.4852 (11) (620) and 1.3558 (15) (444). Grimmite is named after Johann Grimm (24 June or 24 July 1805 to 26 June 1874), the former director of the Příbram Mining College. The association of sulfides and sulfarsenides was found with grimmite. Essentially non-zoned coarse-grained siderite encloses idiomorphic crystals and/or aggregates of red sphalerite I and zoned skutterudite-group minerals. Skutterudites (skutterudite, niklskutterudite and ferroskutterudite) are usually strongly corroded and replaced by younger phases. Relics of skutterudite are rimmed by nickeline and later on by gersdorffite with rare domains of glaucodot and arsenopyrite, whereas completely leached parts of skutterudite crystals are filled up by quartz containing small isolated grains and aggregates of pyrite, sphalerite II, grimmite, galena, ullmannite, bismuthinite, parkerite and jaipurite, the latter being rarely enclosed in grimmite.
    Type of Medium: Online Resource
    ISSN: 1617-4011
    URL: Article
    URL: Article
    DOI: 10.5194/ejm-33-175-2021
    DOI: 10.5194/ejm-33-175-2021-supplement
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 1000286-8
    detail.hit.zdb_id: 2039451-2
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  • 9
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    Genesis and supergene weathering of tetrahedrite-(Hg) in meta-carbonate rocks: Bearing on differential mobility of priority pollutant metals
    Elsevier BV ; 2024
    In:  Ore Geology Reviews Vol. 164 ( 2024-01), p. 105847-
    Details
    In: Ore Geology Reviews, Elsevier BV, Vol. 164 ( 2024-01), p. 105847-
    Type of Medium: Online Resource
    ISSN: 0169-1368
    URL: Article
    DOI: 10.1016/j.oregeorev.2023.105847
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2024
    detail.hit.zdb_id: 2029106-1
    SSG: 13
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  • 10
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    Polytypism of Cronstedtite From Nagybörzsöny, Hungary
    Cambridge University Press (CUP) ; 2020
    In:  Clays and Clay Minerals Vol. 68, No. 6 ( 2020-12), p. 632-645
    Details
    In: Clays and Clay Minerals, Cambridge University Press (CUP), Vol. 68, No. 6 ( 2020-12), p. 632-645
    Abstract: The present study provides an example of the accurate identification of polytypes of trioctahedral 1:1 layered silicates from single-crystal X-ray diffraction data collected with the aid of a four-circle diffractometer equipped with an area detector. Single crystals of the mineral cronstedtite from the Nagybörzsöny gold ore deposit, northern Hungary, were studied. The chemical composition of some crystals was determined by electron probe microanalysis (EPMA). The precession-like images of the reciprocal space (RS) sections created by the diffractometer software and presented in the study were used to determine the OD (ordered-disordered) subfamilies (Bailey’s groups A, B, C, D) and particular polytypes. With one exception, all crystals studied belong to subfamily A. The rare polytype 1 M , a = 5.51, b = 9.54, c = 7.33 Å, β = 104.5°, space group Cm is relatively abundant in this occurrence. Another polytype 3 T, a = 5.51, c = 21.32 Å, space group P 3 1 was also found. Both polytypes occur separately or in mixed, mostly 1 M dominant crystals. Some 1 M polytype crystals are twinned by order 3 reticular merohedry with a 120° rotation along the c hex axis as the twin operation. A rare 1 M +3 T mixed crystal with 1 M part twinned also contains a small amount of subfamily C. A possible presence of the most common 1 T polytype of this subfamily cannot be confirmed because of overlap of the characteristic reflections with those of 3 T . Several completely disordered crystals produced diffuse streaks instead of discrete characteristic reflections on the RS sections. The EPMA revealed Fe, Si, traces of Mg, Al, S, and Cl. One black crystal originally considered to be cronstedtite was identified as (111) twinned sphalerite. Some crystals of cronstedtite are covered partially by a honey-brown crust or small crystals of siderite.
    Type of Medium: Online Resource
    ISSN: 0009-8604 , 1552-8367
    URL: Article
    DOI: 10.1007/s42860-020-00102-9
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2045991-9
    detail.hit.zdb_id: 221428-3
    SSG: 13
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