Formula: Ag3AsS3
Origin of name: from Greek xanthos = yellow and konis = powder
Crystal system: monoclinic
Crystal class: 2/m
Twinning: pm {001} producing pseudo-orthorhombic habit
Unit cell: a = 11.99 Å, b = 6.21 Å, c = 31.88 Å, b = 90.5°
Colour: Yellowish orange to reddish orange to reddish brown, dark orange, dark crimson red
Diaphaneity: Subtranslucent to opaque
Luster: Adamantine
Habit: Crystals tabular, pseudohexagonal, pyramidal or lath-like, rare, massive, reniform, granular
Hardness: 2 to 3
Specific gravity: 5.54
Cleavage: 1; {001} distinct
Tenacity: Subconchoidal fracture, brittle
Streak: Orange-yellow
Synonyms/varieties: Rittingerite
Comments: dimorphous with proustite
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