Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.303.25-3.45
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal, Uneven
Cleavage
None, may show partings on {0001} and {10 1 1}
Good on {110}
Mohs Hardness
66.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references