General Information:
Chemical Formula:
Cu2O
Composition:
(Molecular Weight = 143.09 gm)
Copper 88.82 % Cu
Oxygen 11.18 % O
Empirical Formula:
Cu2O
Environment:
Oxidized zone of copper deposits.
Locality:
Commonly in the copper deposits of SW USA and in Chile.
Name Origin:
From the Latin, cuprum, meaning copper. Chalcotrichite from the Greek, meaning "hairy copper."
Physical Properties:
Cleavage:
[111] Imperfect
Color:
brown red, purple red, red, or black.
Density:
6.1
Diaphaniety:
Transparent to translucent
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Capillary - Very slender and long, like a thread or hair (e.g. millerite).,
Hardness:
3.5-4 - Copper Penny-Flourite
Luminescence:
None.
Luster:
Adamantine
Streak:
brownish red
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