Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.24-2.29
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, Subconchoidal, Conchoidal
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Very poor [100]
Mohs Hardness
6-6.55-5.5
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references