Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.823.80-4.15
1
7.18
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Fracture
-
Uneven
Cleavage
Perfect in one direction, indistinct in one direction
perfect along [010] and [100]
Mohs Hardness
63.5-4
2
10
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Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references