Tenacity
Brittle
-
Solubility
Soluble
Partly soluble in HCl.
Durability
-
-
Specific Gravity
3.30-3.503.32-3.43
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
Perfect on {110}, poor on {101}, {001} rare
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
55.5-6
2
10
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Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references