Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.16-3.233.50-3.60
1
7.18
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Fracture
Conchoidal, Uneven, Conchoidal to uneven
Uneven
Cleavage
[0001] indistinct, [1010] indistinct
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Mohs Hardness
56
2
10
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Chemical Composition
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.