Formula: Tl3AsS4
Origin of name: For Jen-Ho Fang, American crystallographer
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Deep red to maroon
Diaphaneity: Translucent
Luster: Vitreous, tarnishes metallic
Habit: Grains <1mm
Hardness: 2.0 to 2.5
Specific gravity: 6.185 (calculated)
Cleavage: None
Tenacity:
Streak: Orange
Synonyms/varieties:
Comments:
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