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Formula: (Cu,Fe)4Tl2S4
Sulphide, bukovite group,
thallium-bearing mineral
Crystal System: Tetragonal
Specific gravity: 6.15 measured, 6.54 calculated
Hardness: 2½ to 3
Colour: Grey, bronze-black
Common impurities: K,Pb,Cr,Sb,As
Environments
Pegmatites
Hydrothermal environments
Thalcusite occurs in base-metal sulphide deposits and hyperalkalic massifs
(HOM).
Localities
At the Ilímaussaq complex, Kujalleq, Greenland, thalcusite is associated with
gudmundite, cuprostibite,
djerfisherite, galena and
troilite
(HOM).
At the Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Russia, thalcusite is
associated with chalcopyrite,
chalcocite, bornite and
idaite
(HOM).
At the type locality, the Mayak Mine, Talnakh Cu-Ni Deposit, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy
Autonomous Okrug, Krasnoyarsk Krai, Russia, thalcusite occurs in platy deposits, rarely elongated, mostly as
grains 10 to 15 microns in diameter. It occurs in pentlandite -
cubanite - chalcopyrite ores,
associated with platinum and
palladium minerals, and also with
altaite, galena,
sphalerite, djerfisherite,
pentlandite, cubanite and
chalcopyrite
(AM 62.396, HOM).
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