Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.821.98-2.50
1
7.18
👆🏻
Fracture
-
ConchoidalWalter Schumann
Cleavage
Perfect in one direction, indistinct in one direction
None
Mohs Hardness
65.5-6.5
2
10
👆🏻
Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)