Pegmatite

[pegmәtait]

(noun.) a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements.

Typed by Erica--From WordNet

(n.) Graphic granite. See under Granite.

(n.) More generally, a coarse granite occurring as vein material in other rocks.

Edited by Elsie

n. coarsely crystallised granite.—adj. Pegmatit′ic.

Typed by Angelo