Pegmatite

//ˈpɛɡmətaɪt// noun

Definitions

Noun
  1. 1
    A coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica. countable, uncountable
  2. 2
    a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements wordnet

Etymology

From Ancient Greek πήγνυμι (pḗgnumi, “to attach, join”) + -ite

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