Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.503.05-3.21
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Uneven, Subconchoidal, Splintery
Cleavage
None
Good on {110}, poor on {100}
Mohs Hardness
77.5
2
10
👆🏻
Chemical Composition
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references