Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.822.33-2.37
1
7.18
👆🏻
Fracture
-
ConchoidalWalter Schumann
Cleavage
Perfect in one direction, indistinct in one direction
Perfect on {010}, good on {100}
Mohs Hardness
67.5
2
10
👆🏻
Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
Be 2BO 3(OH)Ulrich Henn and Claudio C.