Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.34-2.513.87-4.14
1
7.18
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Fracture
-
Subconchoidal, Conchoidal
Cleavage
None
Poor on {120}, in traces on {001}
Mohs Hardness
-99995.5-6
2
10
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Chemical Composition
SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references