Record details

Title
    Iron-rich chrysoberyl from Kalanga Hill, Muyombe District, north-eastern Zambia
Statement of responsibility
    Vladimír Žáček, Stanislav Vrána
Author
    Vrána, Stanislav
    Žáček, Vladimír
Language
    anglicky
Source title - serial
    Neues Jahrbuch für Mineralogie. Monatshefte
Vol./nr.
    No. 12
Pages
    p. 529-540
Year
    2002
Notes
    2 obr., 2 fot., 6 tab., 16 bibl.
    il.
    Zkr. název ser.: Neu. Jb. Mineral., Mh.
Subject group
    beryl
    chryzoberyl
    mřížkové parametry
    pegmatit
    prvky minoritní
    prvky stopové
    složení chemické
    železo
Geographical name
    Svět
    Zambie
    Zambie (Muyombe)
Keyword
    Chrysoberyl
    District
    Hill
    Iron-rich
    Kalanga
    Muyombe
    North-eastern
    Zambia
Abstract (in english)
   Pegmatite with abundant chrysoberyl occurs at Muyombe in north-eastern Zambia near the Zambia/Malawi border. The pegmatite is composed of quartz, feldspar, chrysoberyl, beryl, muscovite, accessory Nb-Ta oxides and zircon. It cuts HT/LP cordierite-garnet-sillimanite-biotite-spinel granulite of the Ubendian Crystalline Complex. Chrysoberyl is exceptionally rich in iron (3.16 - 6.25, mean 5.1 wt. % Fe2O3) and zoned with rimward decrease of Fe. The most prominent substitution Fe3+ Al1- corresponds to the empirical formula ranging from Be(Al1.94Fe0.05)O4 to Be(Al1.90Fe0.10)O4. Minot TiO2 (up to 0.6 wt.%) and MgO (up to 0.3 wt.%) are also locally present. Lattice parameters calculated from powder diffraction data are: a = 4.4326(07), b = 9.4256(18), c = 5.4893(10) (A), v ´229.34(07) (A3). The origin of chrysoberyl is discussed
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    26. 11. 2007
Import date
    8. 8. 2012