Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.06-5.082.72-2.75
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Conchoidal
Uneven
Cleavage
Poor on [111].
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
3-3.256-6.5
2
10
👆🏻
Chemical Composition
Cu5FeS4
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)