Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.44-2.625.00-5.30
1
7.18
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Fracture
Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Indiscernible
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
2.5-5.56
2
10
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Chemical Composition
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
Fe 2O 3Arthur Thomas , Gemstones (2009)