Tenacity
-
Slightly sectile
Solubility
-
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
Durability
-
-
Specific Gravity
2.55-2.652
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
Perfect {10 1 0}
Prismatic {10 1 0}, perfect
Mohs Hardness
5.5-62-2.5
2
10
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Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references