A common mineral with formula: CaCO3 a Calcium Carbonate. Nevertheless is very attractive material with very high dispersion especially when is colorless.
Essentially remain a collector stone and the price is due mostly on the cutting labour.
The polishing is not an easy task because of the low hardness: 3 plus an perfect cleavage. From Mexico
Size: 21.7x15.7x15.2 mm.
Weight: 33.56 ct.