Tenacity
Brittle
Brittle
Solubility
Dilute acid
Readily soluble in HF
Durability
-
-
Specific Gravity
2.93-2.962.86-2.94
1
7.18
👆🏻
Fracture
Subconchoidal, Conchoidal
Conchoidal, Uneven
Cleavage
Distinct on {010}, imperfect {110} and {011}
None observed
Mohs Hardness
3.5-46.5-7
2
10
👆🏻
Chemical Composition
CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references