Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.372.40-2.42
1
7.18
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Fracture
ConchoidalWalter Schumann
-
Cleavage
Perfect on {010}, good on {100}
{010} Perfect, {001} Distinct
Mohs Hardness
7.54.5
2
10
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Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references