Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.652.60-2.65
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Perfect {10 1 0}
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
5.5-66-6.5
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)