Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.30-3.504.00-4.65
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Uneven, Sub-Conchoidal
Cleavage
Perfect on {110}, poor on {101}, {001} rare
Perfect on [1011]
Mohs Hardness
55-5.5
2
10
👆🏻
Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
ZnCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references