Tenacity
Brittle
Brittle
Solubility
Dilute acid
Soluble
Durability
-
-
Specific Gravity
2.93-2.963.25-3.35
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Distinct on {010}, imperfect {110} and {011}
Perfect in three directions
Mohs Hardness
3.5-45
2
10
👆🏻
Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references