Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.652.6-3.3
1
7.18
👆🏻
Fracture
Conchoidal
Lamellar
Cleavage
Perfect {10 1 0}
Perfect 001
Mohs Hardness
5.5-62-2.5
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6