Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.3922.50-2.80
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
{010} moderate, {100} imperfect
Perfect
Mohs Hardness
6.5-75-6.5
2
10
👆🏻
Chemical Composition
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)