Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.18-3.373.87-4.14
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Conchoidal
Cleavage
Perfect on 210
Poor on {120}, in traces on {001}
Mohs Hardness
5.5-65.5-6
2
10
👆🏻
Chemical Composition
Na(Fe,Mg)7(AlSi7O22)(OH)2
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references