Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.77
1
7.18
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Fracture
Uneven, Conchoidal
Uneven
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Perfect [001] good [010] poor [110]
Mohs Hardness
6-6.56-6.5
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)