Formula: AgCuS
Origin of name: for F. Stromeyer, German chemist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: common on {101}
Unit cell: a = 4.06 Å, b = 6.66 Å, c = 7.99 Å
Colour: dark steel-gray, rapidly tarnishes dark blue
Diaphaneity: opaque
Luster: metallic
Habit: crystals prismatic, pseudohexagonal, massive, compact
Hardness: 2.5 to 3
Specific gravity: 6.2 to 6.3
Cleavage: none
Tenacity: conchoidal, brittle
Streak: steel-gray
Synonyms/varieties:
Comments:
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