Formula: Bi2Fe(Co,Fe)(AsO4)2(O,OH)2(OH)2
Origin of name: Named after the locality and chemical composition
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 9.156, b = 6.148, c = 9.338, α = 83.24°, β = 70.56°, γ = 86.91°
Colour: Brown
Diaphaneity: Transparent to translucent
Luster: Adamantine
Habit: Tabular
Hardness: 4.5
Specific gravity: 5.92 (calculated)
Cleavage: [001] good
Tenacity: Brittle, conchoidal fracture
Streak: Light brown
Synonyms/varieties:
Comments:
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