Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.28-3.313.87-4.14
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Conchoidal
Cleavage
None observed
Poor on {120}, in traces on {001}
Mohs Hardness
6.5-7.55.5-6
2
10
👆🏻
Chemical Composition
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references