Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.302.98-3.10
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
None, may show partings on {0001} and {10 1 1}
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
66
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references