pegmatite

2 definitions found

pegmatite - Collaborative International Dictionary of English v.0.48 :

  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]

pegmatite - WordNet (r) 2.1 (2005) :

  pegmatite
      n 1: a form of igneous rock consisting of extremely coarse
           granite resulting from the crystallization of magma rich in
           rare elements