Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.24-2.291.98-2.50
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Conchoidal
Conchoidal
Cleavage
Very poor [100]
None
Mohs Hardness
5-5.55.5-6.5
2
10
👆🏻
Chemical Composition
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)