Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.302.69-2.79
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
None, may show partings on {0001} and {10 1 1}
Poor on {0001}
Mohs Hardness
65.5-6.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references