Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.823.87-4.14
1
7.18
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Fracture
-
Subconchoidal, Conchoidal
Cleavage
Perfect in one direction, indistinct in one direction
Poor on {120}, in traces on {001}
Mohs Hardness
65.5-6
2
10
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Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references