Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.26-3.415.00-5.30
1
7.18
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Fracture
Fibrous, ConchoidalWalter Schumann
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Distinct on {100}, poor on {110}; parting on {001}
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
7-8.56
2
10
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Chemical Composition
AlAl6O3BSi3O18
Fe 2O 3Arthur Thomas , Gemstones (2009)