Formula: Ca5(PO4,CO3)3 F
Origin of name: From carbonate, fluorine, and the apatite series
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 9.346 Ǻ, c = 6.887 Ǻ
Colour: Colourless to whitish
Diaphaneity:
Luster:
Habit: Crystals well-formed hexagonal prisms; granular massive, globular, reniform, stalactitic, fibrous, earthy
Hardness: 5
Specific gravity: 3.12
Cleavage: 2; {0001} indistinct, {10-10} trace
Tenacity: Conchoidal; brittle
Streak:
Synonyms/varieties: Dehrnite, francolite, carbonate-apatite, collophane (massive, amorphous variety), kurskite (Na-rich variety), lewistonite
Comments:
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