Tenacity
Brittle
-
Solubility
-
Partly soluble in HCl.
Durability
-
-
Specific Gravity
5.00-5.303.32-3.43
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Conchoidal
Cleavage
None, may show partings on {0001} and {10 1 1}
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
65.5-6
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references