Formula: CoTe2
Origin of name: After locality; Matagami Lake mine, Quebec, Canada
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Violet (polished section)
Diaphaneity: Opaque
Luster:
Habit: Massive; equidimensional grains or blade-like grains, minute; or rims on pyrrhotite and chalcopyrite
Hardness: 4.5 to 5.5
Specific gravity: 8.0
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with frohbergite
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