Formula: (Sr,Ca)5(PO4)3(OH,F)
Origin of name: from strontium and apatite group
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 9.565, c = 7.115
Colour: Pale green to yellowish green, green, colourless
Diaphaneity: Transparent to translucent
Luster: Vitreous, greasy on fracture
Habit: Crystals oval, poorly formed, skeletal, sugary
Hardness: 5
Specific gravity: 3.84
Cleavage: 1; {10-10} imperfect
Tenacity: Uneven fracture
Streak:
Synonyms/varieties:
Comments:
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