Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.822.72-2.75
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Perfect in one direction, indistinct in one direction
Perfect on [001], good on [010], imperfect on [110]
Mohs Hardness
66-6.5
2
10
👆🏻
Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)