Tenacity
Brittle
Brittle
Solubility
Dilute acid
Soluble
Durability
-
-
Specific Gravity
2.93-2.963.10-3.20
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Uneven, Conchoidal
Cleavage
Distinct on {010}, imperfect {110} and {011}
Poor to good on (001)
Mohs Hardness
3.5-46-6.5
2
10
👆🏻
Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.