Tenacity
Brittle
-
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.963.19-3.56
1
7.18
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Fracture
Subconchoidal, Conchoidal
Uneven, Conchoidal
Cleavage
Distinct on {010}, imperfect {110} and {011}
{110} Perfect, {010} Indistinct
Mohs Hardness
3.5-45.5-6
2
10
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Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)