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Formula: CuSbSe2
Sulphosalt, chalcostibite group,
copper-, antimony- and
selenium- bearing mineral
Crystal System: Orthorhombic
Specific gravity: 5.884 calculated
Hardness: 3 to 4
Colour: Lead-grey
Common impurities: Fe,Pb,Tl,Hg
Environments
Příbramite is a relatively new mineral, approved in 2015.
Localities
The type locality is the Mine dump, Uranium Mine No. 16, Háje, Příbram District, Central Bohemian Region, Czech
Republic. The complex uranium and base-metal ore district Příbram represent
the largest accumulation of vein-type hydrothermal uranium ores in the Czech
Republic. The selenium-uranium
mineralisation is of low-temperature hydrothermal origin and is bound to a
calcite vein with a thickness varying from tens of centimetres to several
metres. The main ore is represented by uraninite, whereas younger
antraxolite (organic compound containing uranium) predominates in deeper
parts of the deposit.
Příbramite appears in two different mineral associations.
The first one includes, in addition to příbramite,
antimonselite,
dzharkenite, ferroselite,
tiemannite, hakite,
tetrahedrite, uraninite and
a new mercury - copper -
antimony selenide in
calcite gangue (type I).
The second one contains, in addition to příbramite, bytízite,
chaméanite, bukovite,
eskebornite, giraudite,
umangite, hakite and
tetrahedrite in calcite
gangue (type II).
Příbramite (Type I) forms subhedral blade-shaped crystals up to 60 x 13 microns in size, growing together in
aggregates
up to 150 microns across; it partly replaced earlier
permingeatite.
Antimonselite crystals were also observed in close association.
Příbramite (Type II) was also found as anhedral grains up to 15 microns in size growing with
bytízite. Příbramite is lead-grey in colour, opaque and with a
metallic lustre
(EJM 29.4.653-661).
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