Tenacity
-
Brittle
Solubility
insoluble in water
-
Durability
-
-
Specific Gravity
3.62-3.872.90-2.98
1
7.18
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Fracture
Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
None
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
7-7.57.5-8
2
10
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Chemical Composition
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references