Tenacity
Brittle
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
5.00-5.306.86-7.03
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
None, may show partings on {0001} and {10 1 1}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
66-7
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references