Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.653.90-4.00
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
3,1
Perfect on {001}, good on {210}, poor on {010}
Mohs Hardness
73-3.5
2
10
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Chemical Composition
SiO 2Ulrich Henn and Claudio C.
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references