Record details

    Low-temperature Ni-rich löllingite from Háje, Příbram Czech Republic: Rietveld crystal structure refinement
Statement of responsibility
    Petr Ondruš, Ivan Vavřín, Roman Skála, František Veselovský
    Ondruš, Petr
    Skála, Roman
    Vavřín, Ivan
    Veselovský, František
Source title - serial
    Neues Jahrbuch für Mineralogie. Monatshefte
    H. 4
    p. 169-185
    6 obr., 4 fot., 6 tab., 14 bibl.
    Zkr. název ser.: Neu. Jb. Mineral., Mh.
Subject group
    chemismus minerálů
    krystalová struktura
    rudy Ag
    rudy U
    zpřesňování struktury
Geographical name
    Dolní Bory (Žďár nad Sázavou)
    Háje (Příbram)
Abstract (in english)
   Ni-rich löllingite is described from silver mineralization of the complex uranium-polymetallic deposit of Háje ore nodal point, 4 km SE of Příbram. A new paragenetic type - called thereafter "löllingite" - is described in the paper. Major minerals of this paragenesis are Ni-löllingite, roscielinite, calcite (of stage K5), pyrrhotite, galena, silver, and acanthite. Ni-löllingite forms radial spherulitic huddles of trilling composed of thin lenticular- or spindle-shaped crystals about 2mm long and 100 um thick. Trilling on (101) yield nice well-developed stellate shapes specimens in cross-sections. The color is silver-metallic. The elongation of observed Ni-löllingite crystals is along axis b. Recalculation of average of 8 chemical analyses on the basis of 3 atoms pfu gives the empirical formula (Fe 0.61 Ni 0.36 Co 0.04) = 1.01 (As 1.94 S 0.01 Sb 0.03) = 1.98. Unit cell dimensions and densites from the Rietveld crystal structure refinement (assuming orthorhombic s.g.
   Pnnm and Z = 2) are a = 5.243(1), b = 5.978(1), c = 2.9783(6)A, Dx = 7.371(3)g/cm3 for Ni-löllingite from Háje and a = 5.978(1), b = 5.9631(3), c = 2.9007(1) A, Dx = 7.496(1) g/cm3 for löllingite from Dolní Bory, The parameter R can be satisfactory estimated from equation R = 1.01475 - ű(9.9712 - 1.8800.a). In the present work crystal structures of Ni - löllingite from Dolní Bory are refined. Also, low-temperature conditions under which studied Ni - löllingite trilling formed and their morphology are discussed in detail
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    21. 8. 2007
Import date
    8. 8. 2012