Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.21-9999
1
7.18
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Fracture
Uneven, Subconchoidal, Splintery
-
Cleavage
Good on {110}, poor on {100}
-
Mohs Hardness
7.5-9999
2
10
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Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
SiO2, Al2O3, CaO, MgO, FeO