Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.25-2.401.98-2.50
1
7.18
👆🏻
Fracture
-
ConchoidalWalter Schumann
Cleavage
perfect on {010}; good on {100}
None
Mohs Hardness
5-5.55.5-6.5
2
10
👆🏻
Chemical Composition
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)