Tenacity
-
-
Solubility
Partially soluble in water
-
Durability
-
-
Specific Gravity
1.772.55-2.65
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect on {10 1 0}
Perfect {10 1 0}
Mohs Hardness
2-2.55.5-6
2
10
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Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)