Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.85-3.943.30-3.50
1
7.18
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Fracture
Conchoidal, Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{010} Good, {100} Distinct
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
5-5.55
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references