Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.50
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, Conchoidal
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Distinct on {100} and {110}
Mohs Hardness
6-6.55.5-6
2
10
👆🏻
Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)