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Unusual morphological forms of hodrušite from the Rozália vein, Hodruša-Hámre near Banská Štiavnica (Slovak Republic)

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F15%3A%230002604" target="_blank" >RIV/00023272:_____/15:#0002604 - isvavai.cz</a>

  • Result on the web

    <a href="http://www.jgeosci.org/content/jgeosci.188_sejkora.pdf" target="_blank" >http://www.jgeosci.org/content/jgeosci.188_sejkora.pdf</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.3190/jgeosci.188" target="_blank" >10.3190/jgeosci.188</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Unusual morphological forms of hodrušite from the Rozália vein, Hodruša-Hámre near Banská Štiavnica (Slovak Republic)

  • Original language description

    Rare Cu-Bi sulphosalt, hodrusite, occurs in the Rozalia vein (levels X-XIV of the Rozalia mine, Hodrusa-Hamre ore deposit near Banska Stiavnica, central Slovakia) in two unusual morphological forms. The first type are brownish bronze thin acicular striated crystals, up to 3 mm long, which are usually grouped into chaotic or irregular aggregates. The second hodrusite type comprises flattened columnar aggregates, up to 1.5 cm long, overgrown by hematite in quartz gangue. These aggregates are distinctly striated with brownish bronze colour and metallic lustre. The earliest columnar aggregates of hodrusite are locally substantially replaced by bismuthinite; these hodrusite-bismuthinite aggregates are further intensively pushed back by hematite displaying W-and Al-rich zones. Acicular crystals of hodrusite in gangue cavities were later than bismuthinite and hematite and their formation was related to remobilisation of Cu and Bi from earlier altered gangue. Powder X-ray diffraction data and chemical composition of both hodrusite types are similar; their unit-cell parameters were refined (monoclinic space group C-2/m) as: a 17.552(5), b 3.905(1), c 27.167(9) angstrom, beta 92.44(3)degrees, V 1860.5(9) angstrom3 (acicular crystals) and a 17.567(2), b 3.9151(7), c 27.155(5) angstrom, beta 92.43(1)degrees, V 1865.9(4) angstrom3 (columnar aggregates). Cu-for-Bi substitution is characteristic of both hodrusite types; it influences calculated N-chem values (0.98-1.33) to the point that it is impossible to distinguish hodrusite (ideal 1.5) from kupcikite (ideal 1.0). The problem is resolved by Fe and Ag contents: kupcikite has more than 2 at. % Fe, cuprobismutite contains more than 2 at. % of Ag; hodrusite usually has Ag and Fe contents below 2 at. %. Hematite is remarkable for its high WO3 content reaching 4.96 wt. % (0.04 apfu), extremely unusual of a hematite from hydrothermal vein mineralization.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    DB - Geology and mineralogy

  • OECD FORD branch

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2015

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Geosciences

  • ISSN

    1802-6222

  • e-ISSN

  • Volume of the periodical

    60

  • Issue of the periodical within the volume

    1

  • Country of publishing house

    CZ - CZECH REPUBLIC

  • Number of pages

    12

  • Pages from-to

    11-22

  • UT code for WoS article

    000348358700002

  • EID of the result in the Scopus database