Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.902.50
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
Distinct on {100} and {110}
Mohs Hardness
45.5-6
2
10
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Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)