Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.302.33-2.37
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
ConchoidalWalter Schumann
Cleavage
None, may show partings on {0001} and {10 1 1}
Perfect on {010}, good on {100}
Mohs Hardness
67.5
2
10
👆🏻
Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Be 2BO 3(OH)Ulrich Henn and Claudio C.