Formula: AgFe2S3
Origin of name: for Count Sternberg, Czech botanist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: on {130} lamellar
Unit cell: a = 6.645 Å, b = 11.55 Å, c = 12.74 Å
Colour: golden brown, may tarnish violet-blue
Diaphaneity:
Luster: metallic
Habit: crystals hexagonal plates, thin, striated, twinned, fan-shaped aggregates, rosettes
Hardness: 1 to 1.5
Specific gravity: 4.25
Cleavage: 1; {010} perfect, easy
Tenacity: thin lamellae flexible
Streak: black
Synonyms/varieties:
Comments: dimorphous with argentopyrite
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