Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.823.05-3.08
1
7.18
👆🏻
Fracture
-
Subconchoidal, Uneven, Conchoidal
Cleavage
Perfect in one direction, indistinct in one direction
Poor on {100}
Mohs Hardness
65
2
10
👆🏻
Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)