Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.843.16-3.23
1
7.18
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Fracture
Conchoidal
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
none, may show indistinct parting
[0001] indistinct, [1010] indistinct
Mohs Hardness
7-7.55
2
10
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Chemical Composition
(Mg,Fe)3Al2Si3O12
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references