Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.32-2.382.50-2.80
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
-
Cleavage
None
Perfect
Mohs Hardness
5.55-6.5
2
10
👆🏻
Chemical Composition
SiO 2(+Al 2O 3)Walter Schumann , Gemstones of the world (2001)
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)