Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.823.25
1
7.18
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Fracture
-
-
Cleavage
Perfect in one direction, indistinct in one direction
Imperfect in one direction
Mohs Hardness
65-5.5
2
10
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Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
CaCuAlSi 2O 6(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)