Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.302.24-2.29
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Uneven, Subconchoidal, Conchoidal
Cleavage
None, may show partings on {0001} and {10 1 1}
Very poor [100]
Mohs Hardness
65-5.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references