cancrinite

from The Century Dictionary.

• noun In mineralogy, a silicate related to nephelite, but peculiar in containing carbon dioxid.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) A mineral occurring in hexagonal crystals, also massive, generally of a yellow color, containing silica, alumina, lime, soda, and carbon dioxide.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy Any of a family of feldspathoid minerals that are mixed carbonates and aluminosilicates of sodium and calcium.