Formula: Ca3Al7(SiO4)3(PO4)4(OH)3.16.5H2O
Origin of name: for F. Perham, American geologist
Crystal system: hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell: a = 7.022 Å, c = 20.18 Å
Colour: brown
Diaphaneity:
Luster: dull, vitreous on cleavage
Habit: crystals platy, in spherulitic masses to 1 mm, rare
Hardness: 5
Specific gravity: 2.64
Cleavage: none
Tenacity: brittle
Streak: white
Synonyms/varieties:
Comments:
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