Tenacity
Brittle
Brittle
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.962.98-3.03
1
7.18
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Fracture
Subconchoidal, Conchoidal
Uneven
Cleavage
Distinct on {010}, imperfect {110} and {011}
[110] perfect; [010] distinct
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
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.