Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.32-4.483.16-3.23
1
7.18
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Fracture
Uneven, Subconchoidal, Conchoidal
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
{101}, good; {010}, poor
[0001] indistinct, [1010] indistinct
Mohs Hardness
3.55
2
10
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Chemical Composition
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references