Formula: As2S3
Origin of name: from Latin auripigmentum = golden paint
Crystal system: monoclinic
Crystal class: 2/m
Twinning: on {100}
Unit cell: a = 11.49 Å, b = 9.59 Å, c = 4.25 Å, b = 90.5°
Colour: yellow, yellow-orange, brownish yellow
Diaphaneity:
Luster: resinous, pearly on cleavage
Habit: crystals short prismatic, elongated on c-axis, granular, foliated or powdery aggregates, columnar, reniform
Hardness: 1.5 to 2
Specific gravity: 3.49
Cleavage: 2; {010} perfect, {100} traces
Tenacity: sectile, cleavage lamellae
Streak: pale yellow
Synonyms/varieties:
Comments:
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