Tenacity
Brittle
Brittle
Solubility
-
insoluble in water
Durability
-
-
Specific Gravity
2.33-2.375.00-5.20
1
7.18
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Fracture
ConchoidalWalter Schumann
Uneven, Conchoidal, ConchoidalWalter Schumann
Cleavage
Perfect on {010}, good on {100}
Indistinct on {001}; partings on {011} and {111}
Mohs Hardness
7.56-6.5
2
10
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Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references