Tenacity
-
Brittle
Solubility
-
Dilute acid
Durability
-
-
Specific Gravity
3.842.93-2.96
1
7.18
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Fracture
Conchoidal
Subconchoidal, Conchoidal
Cleavage
none, may show indistinct parting
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
7-7.53.5-4
2
10
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Chemical Composition
(Mg,Fe)3Al2Si3O12
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references