Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.60-3.612.90-2.98
1
7.18
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Fracture
Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Imperfect/fair/absent
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
8-8.57.5-8
2
10
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Chemical Composition
Mg 3Al 8BeO 16Walter Schumann , Gemstones of the world (2001) More from other references
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references