Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.445.85-6.15
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
None Observed
Fair in four directions forming octahedrons
Mohs Hardness
6.5-73.5-4
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references