Tenacity
Brittle
Brittle
Solubility
Soluble
Easily soluble in cold dilute HCl
Durability
-
-
Specific Gravity
3.25-3.354.12
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Uneven
Cleavage
Perfect in three directions
Good in two directions parallel to the prism faces {110}
Mohs Hardness
54-4.5
2
10
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Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaZn(AsO4)(OH)