Record details

Title
    Sapphire from Hajnáčka (Cerová Highlands, southern Slovakia)
Statement of responsibility
    Pavel Uher, Martin Sabol, Patrik Konečný, Margaréta Gregáňová, Zdeněk Táborský, Lubica Buškelová
Author
    Buškelová, Lubica
    Gregáňová, Margaréta
    Konečný, Patrik
    Sabol, Martin
    Táborský, Zdeněk
    Uher, Pavel
Language
    anglicky
Source title - serial
    Slovak geological magazine
Vol./nr.
    Vol. 5, no. 4
Pages
    p. 273-280
Year
    1999
Notes
    2 obr., 2 fot., 1 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Slov. geol. Mag.
Subject group
    alkalický bazalt
    drahokamy
    inkluze minerální
    korund
    maar
    parageneze
    petrogeneze
    pliocén
    sedimenty klastické
    Západní Karpaty
Geographical name
    Slovensko
Keyword
    Cerová
    Hajnáčka
    Highlands
    Sapphire
    Slovakia
    Southern
Abstract (in english)
   Tiny (<5mm) blue and pale violet transparent to translucent, locally of the gem-quality sapphire crystals have been found in resedimented psammitic filling of the maar near Hajnáčka village, Slovakia. The maar is associated with Pliocene alkali basalt volcanism. Homogenous to slightly zonal sapphire is close to corundum end-member: 99-100 wt% Fe2O3+FeO, 0-0.7 wt.% TiO2, 0-0.2 wt.% SiO2 and 0-0.2 wt.% Cr2O3; a=4.758, c=12.988 (10-10m), w=1.766, e=1.758. SEM study of sapphire surface indicates rather magmatic corrosion than alluvial transport. Zircon, monazite- (Ce), spinel, Fe-S phase (pyrrhotite?) and Y-U-Th-Nb-Ta-bearing phase are included in sapphire crystals. Olivine, zircon, garnet, titanite, magnetite, spinel, amphibolite (kaersutite), plagioclase and quartz associated with sapphire.
   Corundum probably crytsallized from felsic syenite-like melt, which fractionated from basic-ultrabasic mantle precursor and the crystals were later transported in xenoliths by younger portions of alkali basalt magma up ti surface. Finally sapphire was accumulated in resedimented volcanic and non-volcanic material filling the maar structure
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    1. 4. 2008
Import date
    8. 8. 2012