Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.30-3.502.33-2.37
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
ConchoidalWalter Schumann
Cleavage
Perfect on {110}, poor on {101}, {001} rare
Perfect on {010}, good on {100}
Mohs Hardness
57.5
2
10
👆🏻
Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be 2BO 3(OH)Ulrich Henn and Claudio C.