Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.826.30-6.39
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect in one direction, indistinct in one direction
[001] good, [210] distinct
Mohs Hardness
63-3.5
2
10
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Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references