Is a Sodium Calcium Aluminum Silicate Carbonate with formula: Na6Ca2Al6Si6O24(CO3)2 .
Is one of the rarer member of the Feldspathoid group of minerals. Although is a silicate it react with warm hydrochloric acid. The hardness is 5-6
The crystal are always translucent, rarely are transparent, clean tones are a great rarity.
This gem comes from Bancroft, Ontario,Canada.
Weight: 3.05 ct.