Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-2.982.08-2.16
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Irregular/uneven
Cleavage
Distinct on {11 2 0}, imperfect on {10 1 1}
distinct/good on {1011}
Mohs Hardness
7.5-84.5
2
10
👆🏻
Chemical Composition
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)