Tenacity
Brittle
Brittle
Solubility
Dilute acid
-
Durability
-
-
Specific Gravity
2.93-2.961.79
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Irregular/uneven
Cleavage
Distinct on {010}, imperfect {110} and {011}
Perfect on {10bar10}
Mohs Hardness
3.5-42.5
2
10
👆🏻
Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)