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The Collaborative International Dictionary of English v.0.48:

Micropegmatite \Mi`cro*peg"ma*tite\, n. [Micro- + pegmatite.]
   (Min.)
   A rock showing under the microscope the structure of a
   graphic granite (pegmatite). -- Mi`cro*peg`ma*tit"ic, a.
   [1913 Webster]