Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.98-2.502.55-2.65
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
None
Perfect {10 1 0}
Mohs Hardness
5.5-6.55.5-6
2
10
👆🏻
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)