Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.373.26-3.36
1
7.18
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Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
Perfect on {010}, good on {100}
Good on {100}
Mohs Hardness
7.56.5-7
2
10
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Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references