Tenacity
-
Brittle
Solubility
-
Dilute acid
Durability
-
-
Specific Gravity
3.25-3.502.93-2.96
1
7.18
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Fracture
Uneven
Subconchoidal, Conchoidal
Cleavage
Distinct
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
-99993.5-4
2
10
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Chemical Composition
Ca 10Mg 2Al 4(SiO 4) 5(Si 2O 7) 2(OH) 4Ulrich Henn and Claudio C.
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references