Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.303.355-3.433
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Uneven
Cleavage
None, may show partings on {0001} and {10 1 1}
{???} Good, {???} Good
Mohs Hardness
6-9999
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)