Tenacity
Brittle
-
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.963.03-3.18
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Uneven, Irregular, Conchoidal
Cleavage
Distinct on {010}, imperfect {110} and {011}
{???} Indistinct
Mohs Hardness
3.5-47-7.5
2
10
👆🏻
Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)