Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.303.21-3.38
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Irregular/uneven, Uneven
Cleavage
None, may show partings on {0001} and {10 1 1}
Perfect on {001}
Mohs Hardness
66-7
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references