Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.305.85-6.15
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
None, may show partings on {0001} and {10 1 1}
Fair in four directions forming octahedrons
Mohs Hardness
63.5-4
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references