1-Stop Dictionary Reference

Pegmatite

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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.

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.

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.

The Century Dictionary and Cyclopedia

n. Coarsely crystallized granite. Also called granitel, granitelle.

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

Word Usage

"Coarse granite (known as pegmatite) often breaks up in weathering, leaving large pieces of quartz and feldspar lying on the ground."

Hypernym

Words that are more generic or abstract

igneous rock

Cross Reference

quartz granite feldspar

Variant

granite