Tenacity
Brittle
Brittle
Solubility
-
Gelatinises in acids
Durability
-
-
Specific Gravity
2.60-2.652.4-2.5
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven, Conchoidal
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Distinct on {110}
Mohs Hardness
6-6.55-6
2
10
👆🏻
Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2