Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.303.82-4.00
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
None, may show partings on {0001} and {10 1 1}
{???} Indistinct
Mohs Hardness
65.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)