Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.651.98-2.50
1
7.18
👆🏻
Fracture
Conchoidal
ConchoidalWalter Schumann
Cleavage
Perfect {10 1 0}
None
Mohs Hardness
5.5-65.5-6.5
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)