Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
5.00-5.303.10-3.20
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Uneven, Conchoidal
Cleavage
None, may show partings on {0001} and {10 1 1}
Poor to good on (001)
Mohs Hardness
66-6.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.