Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.6-3.3
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Lamellar
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Perfect 001
Mohs Hardness
6-6.52-2.5
2
10
👆🏻
Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6