Tenacity
-
-
Solubility
-
Partly soluble in HCl.
Durability
-
-
Specific Gravity
2.823.32-3.43
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect in one direction, indistinct in one direction
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
65.5-6
2
10
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Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references