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Enargite

Enargite is a copper arsenic sulfosalt mineral with chemical formula Cu₃AsS₄. Enargite crystals are prismatic or tabular and often doubled. Their surfaces have vertical grooves. However, this mineral can also be present in solid or granular soil. Its color and scratch are dark gray to black. Otherwise it is opaque and has a metallic luster. More info

Enargite is a copper arsenic sulfosalt mineral with chemical formula Cu₃AsS₄. Enargite crystals are prismatic or tabular and often doubled. Their surfaces have vertical grooves. However, this mineral can also be present in solid or granular soil. Its color and scratch are dark gray to black. Otherwise it is opaque and has a metallic luster.
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