Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.655.50-5.90
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
6-6.54
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)