Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.10-3.203.16-3.23
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
Poor to good on (001)
[0001] indistinct, [1010] indistinct
Mohs Hardness
6-6.55
2
10
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Chemical Composition
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references