Formula: (Pb,Cu)3(CrO4,AsO4)2(OH)
Origin of name: For Lucien Fourneau, colonial governor of French Congo
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 13.66 Ǻ, b = 5.91 Ǻ, c = 9.70 Ǻ, β = 94.5°
Colour: Olive-green
Diaphaneity:
Luster:
Habit: Crystals prismatic, small
Hardness:
Specific gravity: 6.27
Cleavage: None
Tenacity:
Streak: Yellow
Synonyms/varieties:
Comments:
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