Formula: Fe(UO2)2(PO4)2 . 8H2O
Origin of name: After locality; Basset mine, Cornwall, England
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common on {010}
Unit cell: a = 6.98 Ǻ, b = 17.07 Ǻ, c = 7.01 Ǻ, β = 90.5°
Colour: Olive-green, greenish-brown, yellowish brown
Luster: Vitreous
Habit: Crystals flattened thin lozenge-shaped plates
Hardness: ~ 2.5
Specific gravity: 3.4 to 3.63
Cleavage: 1; {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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