Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.824.95-5.0
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Perfect in one direction, indistinct in one direction
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
64-5
2
10
👆🏻
Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references