Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.125.5
1
7.18
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Fracture
Subconchoidal, Conchoidal
Conchoidal
Cleavage
Perfect on {10 1 1}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
3-45-5.5
2
10
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Chemical Composition
Ca(Mn,Mg,Fe)(CO3)2
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references