Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3-3.153.25-3.35
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Good on [110] and on [001]
Perfect in three directions
Mohs Hardness
6.0-6.55
2
10
👆🏻
Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references