Tenacity
-
-
Solubility
-
Partially soluble in water
Durability
-
-
Specific Gravity
2.55-2.651.77
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
Perfect {10 1 0}
Perfect on {10 1 0}
Mohs Hardness
5.5-62-2.5
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)