Tenacity
Brittle
Brittle
Solubility
Soluble
Dilute acid
Durability
-
-
Specific Gravity
1.9932.93-2.96
1
7.18
👆🏻
Fracture
Uneven
Subconchoidal, Conchoidal
Cleavage
Perfect on [100], [010], [001]
Distinct on {010}, imperfect {110} and {011}
Mohs Hardness
2.53.5-4
2
10
👆🏻
Chemical Composition
KCl
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references