Tenacity
-
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.69-3.816.86-7.03
1
7.18
👆🏻
Fracture
-
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
8.56-7
2
10
👆🏻
Chemical Composition
BeAl 2O 4Arthur Thomas , Gemstones (2009)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references