Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.785.00-5.30
1
7.18
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Fracture
Uneven, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{???} Distinct, {???} Indistinct
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
5-66
2
10
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Chemical Composition
3CaAl 2Si 2O 8 · CaCO 3Anthony et al , Handbook of mineralogy (2001)
Fe 2O 3Arthur Thomas , Gemstones (2009)