Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.301.79
1
7.18
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Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Irregular/uneven
Cleavage
None, may show partings on {0001} and {10 1 1}
Perfect on {10bar10}
Mohs Hardness
62.5
2
10
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Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)