Tenacity
Brittle
Brittle
Solubility
Easily soluble in cold dilute HCl
Soluble
Durability
-
-
Specific Gravity
4.123.25-3.35
1
7.18
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Fracture
Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
Good in two directions parallel to the prism faces {110}
Perfect in three directions
Mohs Hardness
4-4.55
2
10
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Chemical Composition
CaZn(AsO4)(OH)
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references