Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.30-3.501.79
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Irregular/uneven
Cleavage
Perfect on {110}, poor on {101}, {001} rare
Perfect on {10bar10}
Mohs Hardness
52.5
2
10
👆🏻
Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)