Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.372.70-2.75
1
7.18
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Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
Perfect on {010}, good on {100}
From the Greek for luster, for its pearly luster on the cleavage.
Mohs Hardness
7.54.5-5
2
10
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Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)