Formula: Pb3(Sb,As)O3(OH)Cl2
Origin of name: After locality Thorikos (ancient name), Greece
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 3.919, c = 12.854
Colour: Light yellow
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: crystals extremely small prismatic, tabular on {001}, faces often curved
Hardness: 3
Specific gravity: 7.24
Cleavage: 1; {001} perfect
Tenacity: Very brittle
Streak: White
Synonyms/varieties:
Comments: Found in sea water altered metallugical slags
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