Formula: (Sr,Ca)2Al(PO4)2(OH)
Origin of name: For V. Goedken, American chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 8.45 Ǻ, b = 5.74 Ǻ, c = 7.26 Ǻ, β = 113.7°
Colour: Colourless to pale yellow
Diaphaneity:
Luster:
Habit: Crystals, lozenge-shaped, warped
Hardness: 5
Specific gravity: 3.83
Cleavage: 1; {100} fair
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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