Tenacity
Brittle
-
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.963.76-3.77
1
7.18
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Fracture
Subconchoidal, Conchoidal
-
Cleavage
Distinct on {010}, imperfect {110} and {011}
{110} Perfect, {110} Perfect
Mohs Hardness
3.5-45-6
2
10
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Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.