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Chalcophanite
Chalcophanite is a copper iron sulphide mineral that crystallizes in the tetragonal system. 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.

CharacteristicsEdit

On exposure to air, chalcophanite oxidises to a variety of oxides, hydroxides and sulphates. Chalcophanite is rarely found in association with native copper. .

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