Formula: Ca5(PO4)3(OH)
Origin of name: From hydroxyl and apatite
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell:
Colour: Colourless, white, gray, yellow to yellowish green, green, blue, violet, red, brown
Diaphaneity: Transparent to opaque
Luster: Vitreous to subresinous, silky
Habit: Crystals short to long prismatic, thin to thick tabular or complex; massive compact to coarse granular; fibrous, grain size 0.5-1.5 mm
Hardness: 5
Specific gravity: 3.08
Cleavage: 2; {0001} indistinct; {10-10} trace
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Series with chlorapatite and with fluorapatite
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