Tenacity
-
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
3.28-3.385.00-5.20
1
7.18
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Fracture
Splintery, Fibrous
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Good on [110]
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
6.5-76-6.5
2
10
👆🏻
Chemical Composition
NaAlSi 2O 6Ulrich Henn and Claudio C.
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references