Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.213.50
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Splintery
Uneven, Conchoidal
Cleavage
Good on {110}, poor on {100}
None
Mohs Hardness
7.57
2
10
👆🏻
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Mn 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006)