Tenacity
Brittle
Brittle
Solubility
Easily soluble in cold dilute HCl
-
Durability
-
-
Specific Gravity
4.123.70-3.90
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
Good in two directions parallel to the prism faces {110}
Perfect on {011}, fair on {100}, poor on {110}
Mohs Hardness
4-4.53.5-4
2
10
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Chemical Composition
CaZn(AsO4)(OH)
Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references