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Additional
Copper glance
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Chalcocite
Chalcocite
, copper(I) sulfide (Cu
2
S), is an important
copper
ore
mineral. It is opaque and dark-gray to black with a metallic
luster
. It has a hardness of 2½ - 3 on the
Mohs scale
. It is a
sulfide
with an
orthorhombic
crystal system.
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