Tenacity
Brittle
-
Solubility
Soluble
insoluble in water
Durability
-
-
Specific Gravity
3.30-3.502.51-2.63
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Fibrous
Cleavage
Perfect on {110}, poor on {101}, {001} rare
Perfect basal
Mohs Hardness
52.5-4.5
2
10
👆🏻
Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 3(Si 2O 5)(OH) 4Gemdat.org , Management Team (2012)