agpaite
noun
ag·pa·ite
| \ ˈag-pə-ˌīt\
plural -s
Definition of agpaite
: any of a group of feldspathoid rocks (such as naujaites, lujauvrites, or kakortokites) from Ilimausak, Greenland, which differ from normal nephelite-syenites in having alumina in excess of the alkalies
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