Tenacity
Brittle
-
Solubility
Soluble
insoluble
Durability
-
-
Specific Gravity
3.30-3.502.36
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Uneven, Subconchoidal, Fibrous
Cleavage
Perfect on {110}, poor on {101}, {001} rare
[110] perfect, [101] good, [010] distinct
Mohs Hardness
53.5-4
2
10
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Chemical Composition
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references