Formula: PbAs2S4
Origin of name: for Sartorius van Waltershausen, German mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning: common on {100} lamellar
Unit cell: a = 19.62 Å, b = 7.89 Å, c = 4.19 Å, b = 90°
Colour: lead-gray
Diaphaneity:
Luster: metallic
Habit: crystals prismatic, deeply striated, terminations rounded, irregular or cavernous
Hardness: 3
Specific gravity: 5.10
Cleavage: 1; {100} fair
Tenacity: brittle
Streak: brown
Synonyms/varieties: scleroclase
Comments:
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