Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.65-9999
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
-
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
None
Mohs Hardness
6-6.53-4
2
10
👆🏻
Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Celestite, Andalusite, Feldspar, Dolomite, Gypsum, Halloysite, Kaolinite, Montmorillonite, Sepiolite, Smectite, Vermiculite