Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.13-3.75-9999
1
7.18
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Fracture
Subconchoidal, Uneven, Conchoidal
-
Cleavage
Poor on {100}
-
Mohs Hardness
6-9999
2
10
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Chemical Composition
(Mg,Fe2+ ) 9(SiO 4) 4(F,OH)) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO2, Al2O3, CaO, MgO, FeO