Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.825.00-5.30
1
7.18
👆🏻
Fracture
-
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Perfect in one direction, indistinct in one direction
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
66
2
10
👆🏻
Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
Fe 2O 3Arthur Thomas , Gemstones (2009)