Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.503.90-4.00
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
Distinct on {100} and {110}
Perfect on {001}, good on {210}, poor on {010}
Mohs Hardness
5.5-63-3.5
2
10
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Chemical Composition
3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references