Record details

Title
    Minerály série goyazit-svanbergit a kemmlitzit na pyropovém ložisku Vestřev u Hostinného
Statement of responsibility
    František Novák, Petr Pauliš, Bohumil Moravec
Other titles
    Minerals of goyazite-svanbergite series and kemmlitzite from pyrope deposit Vestřev near Hostinné, Northern Bohemia
Author
    Moravec, Bohumil
    Novák, František
    Pauliš, Petr, 1956-
Language
    česky
Source title - serial
    Věstník Českého geologického ústavu (Bulletin of the Czech Geological Survey)
Vol./nr.
    Roč. 72, č. 4
Pages
    s. 373-380
Year
    1997
Notes
    5 diagr., 3 fot., 5 tab., 27 bibl.
    Anglické resumé
    Zkr. název ser.: Věst. Čes. geol. Úst. (Bull. Czech geol. Surv.)
Subject group
    arzenáty
    chemismus minerálů
    drahokamy
    granáty
    krystalochemie
    kvartér Českého masivu
    sulfáty
    těžké minerály
Geographical name
    ČR-Čechy
    Dolní Olešnice-Vestřev (Trutnov, Trutnov)
Keyword
    Goyazit-svanbergit
    Hostinného
    Kemmlitzit
    Ložisku
    Minerály
    Pyropovém
    Série
    Vestřev
Abstract (in english)
   oyazite, svanbergite and kemmlitzite were identified among heavy minerals from pyrope deposit Vestřev near Hostinné in northern Bohemia. Pyropes are deposited in alluvial sandy gravels of the Olešnický potok Creek and accompanied by hematite, titanomagnetite, magnetite, rutile, zircon, tourmaline, almadine and 16 other rare minerals. The minerals of goyazite - svanbergite series from mostly grey white, 2-6 mm large, rounded or elongated grains composed of predominantly homogennous aggregates of cryptocrystalline nature. Goyazite has d=3.17, 3.27 and hexagonal cell parameters with a7.012(2), c=16.57(1)10 -10 m. Svabergite has d 3.19 and hexagonal cell parameters with a=6.990(2), c=16.54(2) 10 -10. Sample No.15 with empirical formula (Sr0.743 Ce0.112 La0.020, Nd0.012) 0.887 (Al2.885 Fe0.118 3+) 3.003 /(PO4) 1.085 (SO4) 0.874 (AsO4) 0.038) 1.997 (OH)6 shows chemical composition which is the closest to pure svanbergite.
   From the ternary diagram (PO4)3 - (AsO4)3 - (SO4)2- (Fig.1) follows that goyazite and svanbergite form almost continuous series of solid solutions often with transition members near their boundaries. Kemmlitzite was-found in one grain only, and its empirical formula is (Sr0.700 Ce0.085 Nd0.057 La. 0.052) 0.894 Al3.012/(PO4) 0.824 (AsO4) 0.626 (SO4) 0.539/1.989 (OH)6. Its hexagonal cell parameters are a=7.012(2), c=16.60(1) 10 -10. All analysed minerals contain relatively increased admixture of TR with the following relative abundance: Ce LaNd>Pr, to a lesser extent Ce Nd>La. The described minerals originated as authigenic products of diagenetic processes in Permian sandstones of the Vrchlabí Formation which were the source of the respective elements
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    25. 3. 2008
Import date
    8. 8. 2012