Record details

Title
    Ondrušite, CaCu4(AsO4)2 (AsO3OH)2 . 10 H2O, a new mineral species from the Jáchymov ore district, Czech Republic:description and crystal-structure determination
Author
    Císařová, Ivana
    Hloušek, Jan
    Plášil, Jakub
    Sejkora, Jiří
    Veselovský, František
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Canadian Mineralogist
Vol./nr.
    Roč. 49, č. 3
Pages
    13
Year
    2011
Thesaurus term
    ondrušite, new mineral species, lindackerite group, X-ray powder data, crystal structure, electron-microprobe data, thermal analysis, infrared spectroscopy, Jáchymov ore district, Czech Republic
Keyword
    10
    AsO3OH)2
    CaCu4(AsO4)2
    Crystal-structure
    Czech
    Determination
    District
    H2O
    Jáchymov
    Mineral
    New
    Ondrušite
    Ore
    Republic:description
    Species
Abstract (in english)
   Ondrusite, CaCu4(AsO4)2(AsO3OH)2 . 10H2O, is a new supergene mineral species from the Geister vein (Rovnost mine) and the Geschieber vein (Svornost mine), at the Jachymov (St. Joachimsthal) ore district, Czech Republic. It is commonly associated with lindackerite, geminite, lavendulan, slavkovite, strashimirite, olivenite, picropharmacolite and kottigite. It forms white, whitish green, grey-green or apple-green crystalline crusts or aggregates composed of fine platy or lath-shaped translucent crystals up to 2 mm in size, on fissures of partly weathered mineralized quartz veins. It has a white to greyish white streak with a greenish tint, and a vitreous luster; it does not fluoresce under both short- and long-wave ultraviolet light. Cleavage on {001} is perfect, the Mohs hardness is similar to 2-3, and the mineral is very brittle with an irregular fracture. Ondrusite is triclinic, space group P-1, a 6.432(1), b 7.986(1), c 10.827(1) angstrom, alpha 85.75(1), beta 81.25(1), gamma 85.04(1
   )degrees, V 546.6(1) angstrom3, Z = 1. The chemical analyses by electron microprobe and the thermal analysis for H2O yielded MgO 0.42, CaO 5.27, NiO 0.03, CoO 0.08. CuO 29.90, PbO 0.16, P2O5 0.33, As2O5 44.92, H2O 19.40, for a total of 100.51 wt.%. The crystal structure of ondrusite was solved by direct method and refined to a R1 index of 9.80% based on all 2888 reflections collected on a single-crystal diffractometer with MoKalpha X-radiation. The crystal structure consists of CuO6-AsO4-AsO3OH chains two polyhedra thick that form sheets connected through the bridging CaO6 octahedra. In the sheet-to-sheet bonding, CaO6 octahedra and AsO4 groups are involved, whereas the AsO3OH groups bond the CuO6 polyhedra only. One other H2O group is located between the sheets.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014