Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.351.79
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Irregular/uneven
Cleavage
Perfect in three directions
Perfect on {10bar10}
Mohs Hardness
52.5
2
10
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Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)