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Formula: CoTe2
Telluride, marcasite group,
cobalt-bearing mineral, forms a series with
frohbergite
Crystal System: Orthorhombic
Specific gravity: 8.00 calculated
Hardness: 5½
Colour: Violet
Common impurities: Fe,Sb
Environments
Localities
At the type locality, the Mattagami Lake mine, Matagami, Nord-du-Québec, Québec, Canada, mattagamite occurs
in a small zone of telluride ore. The gangue is generally very rich
in talc although chlorite in place
of talc is present in some specimens.
Magnetite and altaite are common
ore minerals in the telluride zone and
sphalerite and chalcopyrite
are abundant in some specimens. Other minerals that are present include
cobaltite, pyrrhotite,
pyrite, hessite,
tellurantimony and mattagamite.
Mattagamite was found in only one specimen, which contained fairly abundant
sphalerite and chalcopyrite.
It occurs as grains isolated in altaite, and as irregular rims on
pyrrhotite and chalcopyrite
in contact with altaite. Hessite is
sometimes associated with the mattagamite rims
(CM 12.55-60).
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