Tenacity
Brittle
Brittle
Solubility
Gelatinises in acids
-
Durability
-
-
Specific Gravity
2.4-2.52.60-2.65
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven, Conchoidal
Cleavage
Distinct on {110}
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
5-66-6.5
2
10
👆🏻
Chemical Composition
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)