Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.303.0-3.1
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
None, may show partings on {0001} and {10 1 1}
Perfect on {001}
Mohs Hardness
63.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Ca(Mg,Al)3(Al3Si)O10(OH)2