Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.30-3.502.55-2.70
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
Perfect on {110}, poor on {101}, {001} rare
None
Mohs Hardness
56.5-7
2
10
👆🏻
Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)