Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.60-2.652.75
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, Conchoidal
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Imperfect on {110}
Mohs Hardness
6-6.55.5
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.