Tenacity
Brittle
Brittle
Solubility
Easily soluble in cold dilute HCl
-
Durability
-
-
Specific Gravity
4.123.82-3.97
1
7.18
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Fracture
Uneven
Subconchoidal, Conchoidal
Cleavage
Good in two directions parallel to the prism faces {110}
Perfect on [001] and [011]
Mohs Hardness
4-4.55.5-6
2
10
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Chemical Composition
CaZn(AsO4)(OH)
TiO 2Michael OâDonoghue , Gems, Sixth edition (2006) More from other references