Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.822.40-2.42
1
7.18
👆🏻
Fracture
-
-
Cleavage
Perfect in one direction, indistinct in one direction
{010} Perfect, {001} Distinct
Mohs Hardness
64.5
2
10
👆🏻
Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references