Formula: Ta2O5
Origin of name: from composition
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 3.8, b = 3.79, c = 35.74, α = 90.92°, β = 90.18°, γ = 90°
Colour: Colourless
Diaphaneity: Transparent
Luster: Adamantine
Habit: Lenticular grains, 0.4 to 0.5 mm, veinlets and lenses in microlite, 0.02 by 0.5 mm
Hardness: 7
Specific gravity: 8.45
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Weak blue cathodeluminescence
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