Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.823.25-3.35
1
7.18
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Fracture
-
Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect in one direction, indistinct in one direction
Perfect in three directions
Mohs Hardness
65
2
10
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Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references