Formula: Al2(PO4)F2(OH) . 7H2O
Origin of name: From old name for composition, 'fluate of alumine'
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 11.22 Ǻ, b = 21.16 Ǻ, c = 8.458 Ǻ
Colour: Colourless, pale yellow, white
Diaphaneity:
Luster: Vitreous
Habit: Crystals dipyramidal, small
Hardness: 3
Specific gravity: 2.18
Cleavage: 2; {010} and {111} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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