Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.00-2.453.30-3.50
1
7.18
👆🏻
Fracture
Sub-Conchoidal, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
none
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
2-45
2
10
👆🏻
Chemical Composition
Cu2H2Si2O5(OH)4
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references