Tenacity
Brittle
Brittle
Solubility
Soluble
Soluble
Durability
-
-
Specific Gravity
3.25-3.352.95-2.96
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
Perfect in three directions
None
Mohs Hardness
57-7.5
2
10
👆🏻
Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references