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Formula: Cu6(Cu4Cd2)Sb4Se13
Sulphselenide, hakite subgroup,
tetrahedrite group,
cadmium- and antimony-
bearing mineral
Crystal System: Isometric
Specific gravity: 6.019 calculated
Hardness: 3½ to 4
Colour: Black
Environments
Hakite-(Cd) is a new mineral, approved in 2022.
Localities
The type locality is the Mine dump, Uranium Mine No. 16, Háje, Příbram District, Central Bohemian Region, Czech Republic.
In the Příbram uranium and base-metal district, there are four main mineralisation stages:
(1) siderite-sulphidic;
(2) calcite;
(3) calcite–uraninite;
(4) calcite-sulphidic.
Selenide mineralisation occurs in close association with
uraninite of the
calcite–uraninite mineralisation, but
selenides are always younger than
uraninite. Uranium ore is represented
by uraninite, coffinite and
uranium-bearing anthraxolite
(pyrobitumen). The
selenium-uranium mineralisation is of
low-temperature hydrothermal origin and is associated with calcite veins, tens
of centimetres to several metres thick. The observed selenide assemblage is
extraordinarily rich, with the total number of selenide species exceeding 25
and including the recently approved new species příbramite,
bytízite and pošepnýite, along with
the three new members of the hakite series hakite-(Cd),
hakite-(Fe) and hakite-(Zn).
These new members of the hakite series were identified in
calcite-uraninite
gangue.
Hakite-(Cd) occurs in close association with clausthalite,
cadmoselite and hakite-(Hg).
Hakite-(Cd) occurs as anhedral grains and veinlets up to 100 μm in size. It is locally replaced by lath-shaped
crystals of cadmoselite, the replacement starting from the centre of
aggregates
(MM 88.5.602-612).
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