Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.375.00-5.30
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Perfect on {010}, good on {100}
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
7.56
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
Fe 2O 3Arthur Thomas , Gemstones (2009)