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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Origin and Etymology of agpaite
Agpa, locality in southern Greenland + 1-ite
First Known Use: 1913
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