Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.373.34-3.44
1
7.18
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Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
Perfect on {010}, good on {100}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
7.58-8.5
2
10
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Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references