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Chalcopyrite
Chalcopyrite
( ) is a
copper
iron
sulfide mineral
that crystallizes in the
tetragonal
system. It has the
chemical formula
CuFeS
2
. It has a
brassy
to golden yellow color and a
hardness
of 3.5 to 4 on the
Mohs scale
. Its streak is diagnostic as green tinged black.
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