Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.43-3.443.25-3.35
1
7.18
👆🏻
Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
None Observed
Perfect in three directions
Mohs Hardness
6.5-75
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references