Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.303.28-3.31
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
None, may show partings on {0001} and {10 1 1}
None observed
Mohs Hardness
66.5-7.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.