Enargite
Enargite is a sulfosalt mineral known for its striking metallic crystals, with notable Chinese occurrences.
About Enargite
Enargite belongs to the sulfosalt class in the enargite group and has the chemical formula Cu3AsS4. It crystallizes in the orthorhombic system and is relatively soft, requiring careful handling.
Identification & care
Enargite typically forms prismatic, tabular crystals; striated; massive; granular. Its color is typically gray-black to iron-black and violet tinge on cleavage. The luster is metallic, the streak is black, grayish black, and specimens are typically opaque. The cleavage is perfect on {110}; good on {100} and {010}. The fracture is uneven, which aids identification.
Collector context
Collector notes
In the metallic-crystal category, Enargite is a consistent target for serious collectors. Jiama Cu-polymetallic deposit is an important Chinese source for the species.