Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.302.59-2.60
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
-
Cleavage
None, may show partings on {0001} and {10 1 1}
{001} Perfect, {110} Distinct, {101} Distinct
Mohs Hardness
66-7
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)