Found 2 items, similar to pegmatite.
English → English (WordNet) Definition: pegmatite pegmatite n : a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
English → English (gcide) Definition: Pegmatite Pegmatite \Peg"ma*tite\, n. [From Gr. ? something fastened together, in allusion to the quartz and feldspar in graphic granite: cf. F. pegmatite. See Pegm.] (Min.) (a) Graphic granite. See under Granite. (b) More generally, a coarse granite occurring as vein material in other rocks. [1913 Webster]