Formula: Tl2O3
Origin of name: For Avicennna (930-1037), medieval Arab (Uzbek, Persian) physician and philosopher, who lived in Bukhara, Tadzhikistan
Crystal system: Cubic
Crystal class: 2/m -3
Unit cell: a = 10.547 Å
Colour: Grayish-black
Diaphaneity: Opaque
Habit: Small crystals, as coating on carlinite
Hardness: 1.5-2.5
Specific gravity: 8.9
Cleavage: None
Streak: Grayish-black, black with brownish tint
Synonyms/varieties:
Comments: Found in the weathered zone of a hematite-calcite vein cutting banded marmorised and silicified limestones near a granite-gneiss contact; formed by oxidation of carlinite in carbonaceous gold ores in silicified limestones and quartz.
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