Tenacity
Brittle
Brittle
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.965.00-5.30
1
7.18
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Fracture
Subconchoidal, Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Distinct on {010}, imperfect {110} and {011}
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
3.5-46
2
10
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Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe 2O 3Arthur Thomas , Gemstones (2009)