Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.352.65
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect in three directions
3,1
Mohs Hardness
57
2
10
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Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2Ulrich Henn and Claudio C.