Formula: PbFe2(VO4)2(OH)2
Origin of name: After locality; Mounana mine, Haut-Ogoue, Gabon
Crystal system: Triclinic
Crystal class: -1
Twinning: Common about [001] axis or on {111}
Unit cell: a = 5.55 Ǻ, b = 7.66 Ǻ, c = 5.56 Ǻ, α = 111.0˚, β = 112.1˚, γ = 94.2˚
Colour: Brownish red
Diaphaneity:
Luster:
Habit: Crystals platy, elongated on c-axis
Hardness:
Specific gravity: 4.85
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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