Formula: CaAl(PO4)(OH)2 . H2O
Origin of name: For Forest Fogg, American collector
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 9.270 Ǻ, b = 21.32 Ǻ, c = 5.190 Ǻ
Colour: Colourless to white
Diaphaneity:
Luster:
Habit: Crystals platy forming radial aggregates or balls, microscopic
Hardness: 4
Specific gravity: 2.78
Cleavage: 2; {010} perfect, {100} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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