Tenacity
Brittle
Brittle
Solubility
Easily soluble in cold dilute HCl
insoluble
Durability
-
-
Specific Gravity
4.126.86-7.03
1
7.18
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Fracture
Uneven
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Good in two directions parallel to the prism faces {110}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
4-4.56-7
2
10
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Chemical Composition
CaZn(AsO4)(OH)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references