Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.3922.55-2.65
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
{010} moderate, {100} imperfect
Perfect {10 1 0}
Mohs Hardness
6.5-75.5-6
2
10
👆🏻
Chemical Composition
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)