General Information:
Chemical Formula:Cu5Se4
Composition:(Molecular Weight = 633.57 gm)Copper 50.15 %
CuSelenium 49.85 %
Se Empirical Formula: Cu5Se4
IMA Status:Approved IMA 1969
Locality:Martin Lake mine, Uranium City, Lake Athabasca, SK, Canada.
Name Origin:Named for the locality.
Physical Properties: Color:blue gray or gray white.
Density:6.59
Diaphaniety:Opaque
Habits:Microscopic Crystals - Crystals visible only with microscopes., Anhedral Grains - Granular minerals without the expression of crystal shapes,
Hardness:2.5-3 - Finger Nail-Calcite
Luster:Metallic
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