Tenacity
Brittle
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
5.00-5.302.95-2.96
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
None, may show partings on {0001} and {10 1 1}
None
Mohs Hardness
67-7.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Mg 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references