Cancrinite

Cancrinite is a complex carbonate of sodium with the formula Na 3)2|Al. It is classed as a member of the feldspathoid; the alkali. Yellow, orange, pink, white or even blue, it has a vitreous or pearly luster of 5–6 and an uneven conchoidal fracture. It is unusual among the silicate minerals in that it will effervesce with hydrochloric acid.

Found originally in 1839 in the Ural Mountains , it is named after Georg von Cancrin minister of finance.