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Formula: Cu6(Cu4Hg2)Sb4Se13
Sulphosalt, hakite subgroup,
tetrahedrite group, mercury-,
antimony- and selenium- bearing mineral
Crystal System: Isometric
Specific gravity: 6.3 calculated
Hardness: 4½
Streak: White
Colour: Grey-brown to creamy white
Common impurities: As
Environments
Hakite-(Hg) occurs in epithermal calcite veins. Associated minerals
include berzelianite,
clausthalite, umangite,
chalcopyrite, pyrite,
uraninite, hematite,
goethite and gold
(HOM).
Localities
At the Příbram District, Central Bohemian Region, Czech Republic, hakite-(Hg) was found to be locally abundant
and was
identified in several samples with selenium mineralisation. As well as
hakite-(Hg) two other chemically distinct types of "hakite" were distinguished,
zinc-rich "hakite-(Zn)" and
cadmium-rich
"hakite-(Cd)".
Hakite-(Hg) dominates among the samples studied.
The evolution of hydrothermal fluids, from which selenium mineralisation
formed,
suggests a distinct enrichment in sulphur and depletion in
selenium over the time span of crystallisation
(MM 80.6.1115–1128).
At the type locality, the Předbořice deposit, Předbořice, Kovářov, Písek District, South Bohemian Region, Czech
Republic, hakite-(Hg) occurs as anhedral grains to 0.3 mm in epithermal
calcite veins, associated
with berzelianite,
clausthalite, umangite and six
other selenides, as well as chalcopyrite,
pyrite, pitchblende,
hematite,
goethite and native gold
(AM 57.1553-1554).
Hakite-(Hg) from Předbořice - Image
At Alberoda, Aue-Bad Schlema, Erzgebirgskreis, Saxony, Germany, among the minerals of the
selenide assemblage at the
uranium deposit, members of the
giraudite–hakite-(Hg) solid solution intergrown with
berzelianite and galena have
been identified as rare and previously unknown phases. They form complexly zoned, anhedral, minute (less than 350 μm
in size)
grains embedded in a dolomite matrix
(CM 40.4.1161-1170).
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