Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.352.50-2.80
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
-
Cleavage
Perfect in three directions
Perfect
Mohs Hardness
55-6.5
2
10
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Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)