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Formula: (Cu,Fe)4As(Se,S)4
Sulphosalt, arsenic- and selenium-
bearing mineral
Crystal System: Isometric
Specific gravity: 6.17 calculated
Hardness: 4½
Colour: Grey
Environments
Seedimentary environments
Hydrothermal environments
Localities
At the type locality, the Chaméane Uranium Deposit, Le Vernet-Chaméane, Issoire, Puy-de-Dôme, Auvergne-Rhône-Alpes,
France, chaméanite, together with geffroyite and
giraudite, occurs in a complex
quartzitic vein cutting
granite.
Three stages of mineralisation are recognized.
In the first stage pitchblende was deposited with copious
baryte gangue.
In the second stage quartz was deposited with
löllingite, arsenopyrite,
pyrite, chalcopyrite,
tetrahedrite, tennantite
and clausthalite, with partial replacements of
baryte by quartz,
pitchblende by chalcopyrite,
and chalcopyrite by
clausthalite.
In the third stage the selenides
bukovite, athabascaite,
umangite, eucairite,
eskebornite, more
clausthalite, chaméanite,
geffroyite and giraudite occur
with an ankerite gangue, followed
by a second generation of chalcopyrite.
The chaméanite occurs in myrmekite-like intergrowths with
giraudite, but mostly associated with
eskebornite and geffroyite
(AM 67.1074-1075).
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