Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.30-3.503.85-3.94
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal, Uneven
Cleavage
Perfect on {110}, poor on {101}, {001} rare
{010} Good, {100} Distinct
Mohs Hardness
55-5.5
2
10
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Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)