Tenacity
Brittle
Brittle
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.962.65
1
7.18
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Fracture
Subconchoidal, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Distinct on {010}, imperfect {110} and {011}
3,1
Mohs Hardness
3.5-47
2
10
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Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2Ulrich Henn and Claudio C.