Tenacity
Brittle
-
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.962.9-3.5
1
7.18
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Fracture
Subconchoidal, Conchoidal
Conchoidal
Cleavage
Distinct on {010}, imperfect {110} and {011}
{110} Perfect, {???} Distinct, {???} Distinct
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
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)