Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.40-2.422.33-2.37
1
7.18
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Fracture
-
ConchoidalWalter Schumann
Cleavage
{010} Perfect, {001} Distinct
Perfect on {010}, good on {100}
Mohs Hardness
4.57.5
2
10
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Chemical Composition
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be 2BO 3(OH)Ulrich Henn and Claudio C.