Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.79-3.942.72-2.75
1
7.18
👆🏻
Fracture
Lamellar, Splintery
Uneven
Cleavage
{100} Good, {001} Good, {010} Poor
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
46-6.5
2
10
👆🏻
Chemical Composition
FeAs
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)