Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.26-3.413.90-4.00
1
7.18
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Fracture
Fibrous, ConchoidalWalter Schumann
Conchoidal
Cleavage
Distinct on {100}, poor on {110}; parting on {001}
Perfect on {001}, good on {210}, poor on {010}
Mohs Hardness
7-8.53-3.5
2
10
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Chemical Composition
AlAl6O3BSi3O18
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references