Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-2.983.32-3.43
1
7.18
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Fracture
Conchoidal, ConchoidalWalter Schumann
Conchoidal
Cleavage
Distinct on {11 2 0}, imperfect on {10 1 1}
Poor on {110} and {100} very poor on {001}
Mohs Hardness
7.5-86-7
2
10
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Chemical Composition
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4