Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.302.90-3.14
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal, Uneven
Cleavage
None, may show partings on {0001} and {10 1 1}
Imperfect; basal
Mohs Hardness
67.5-8
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.