Tenacity
-
Brittle
Solubility
-
Dilute acid
Durability
-
-
Specific Gravity
2.6-3.32.93-2.96
1
7.18
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Fracture
Lamellar
Subconchoidal, Conchoidal
Cleavage
Perfect 001
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
2-2.53.5-4
2
10
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Chemical Composition
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references