from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A coarse-grained granite, sometimes rich in rare elements such as uranium, tungsten, and tantalum.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A coarsely crystalline igneous or plutonic rock composed primarily of feldspar and quartz, normally with muscovite and/or biotite mica. Often contains other minerals, which may be of economic importance. Pegmatite is chemically identical to granite, but has a much coarser crystal structure. Common colors are gray, white, and pink. Pegmatite is quarried for decorative stone and as a source of beryllium, columbium and tantalum when these are present. Gemstones of the quartz/silicate family may also be found in pegmatites.
from the GNU version of the Collaborative International Dictionary of English
- n. Graphic granite. See under granite.
- n. More generally, a coarse granite occurring as vein material in other rocks.
from The Century Dictionary and Cyclopedia
- n. Coarsely crystallized granite. Also called granitel, granitelle.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
Greek pēgma, pēgmat-, something fastened together (from pēgnunai, to fasten; see pag- in Indo-European roots) + -ite1.(American Heritage® Dictionary of the English Language, Fourth Edition)