a. Said of an igneous rock that contains more alkali metals than is considered average for the group of rocks to which it belongs. AGI
b. Said of an igneous-rock series that contains more sodium and/or potassium than is required to form feldspar with the available silica. AGI
c. Said of an igneous-rock series containing less than 51% silica when the weight percentages of CaO and of K2 O + Na2 O are equal. AGI
d. Said of an igneous rock belonging to the Atlantic suite. Syn: alkali; alkaline. AGI
Source:
Dictionary of Mining, Mineral, and Related Terms












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