Tenacity
Brittle
Brittle
Solubility
-
Easily soluble in cold dilute HCl
Durability
-
-
Specific Gravity
2.60-2.654.12
1
7.18
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Fracture
Uneven, Conchoidal
Uneven
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Good in two directions parallel to the prism faces {110}
Mohs Hardness
6-6.54-4.5
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
CaZn(AsO4)(OH)