Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99993.13-3.75
1
7.18
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Fracture
-
Subconchoidal, Uneven, Conchoidal
Cleavage
-
Poor on {100}
Mohs Hardness
-99996
2
10
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Chemical Composition
SiO2, Al2O3, CaO, MgO, FeO
(Mg,Fe2+ ) 9(SiO 4) 4(F,OH)) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references