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.
This gem has a vivid bluish fluorescence at shor wave and for few second is also phosphorescent.From India.
Size: 13.2x12x7.5 mm.
Weight: 6.08 ct.