Formula: PbO3(UO2)4(OH)4 . 4H2O
Origin of name: For P. Fourmarier, Belgian mineralogist
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 14.00 Ǻ, b = 16.47 Ǻ, c = 14.39 Ǻ
Colour: Reddish orange to red, reddish brown to brown
Diaphaneity:
Luster: Adamantine
Habit: Crystals tabular, elongated, pseudohexagonal, microscopic; massive, compact crystalline
Hardness: 3 to 4
Specific gravity: 5.74
Cleavage: 2; {001} perfect, {100} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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