Tenacity
Brittle
Brittle
Solubility
Dilute acid
Soluble
Durability
-
-
Specific Gravity
2.93-2.962.95-2.96
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Conchoidal
Cleavage
Distinct on {010}, imperfect {110} and {011}
None
Mohs Hardness
3.5-47-7.5
2
10
👆🏻
Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 3B 7O 13ClMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references