Formula: Ag2S
Origin of name: From silver (Latin argentum)
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Unit cell: a = 4.89 Å
Colour: Lead-grey to blackish lead-grey
Diaphaneity: Opaque
Habit: Crystals usually cubic or octahedral; dodecahedral; modified and distorted; massive, branching, reticulated; granular
Hardness: 2 to 2.5
Specific gravity: 7.2 to 7.34
Cleavage: 2; {001} and {011} poor
Streak: Black
Synonyms/varieties: Silver glance
Comments: Not IMA approved. Dimorphous with acanthite; stable only above 177°C
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