Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.59-2.602.33-2.37
1
7.18
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Fracture
-
ConchoidalWalter Schumann
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
Perfect on {010}, good on {100}
Mohs Hardness
6-77.5
2
10
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Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
Be 2BO 3(OH)Ulrich Henn and Claudio C.