Encyclopedia > Pegmatite

  Article Content

Pegmatite

Pegmatite is a very coarse-grained igneous rock having a grain size of 20 mm or more; such rocks are referred to as pegmatitic.

Most pegmatites are granite with quartz, feldspar, and mica. Pegmatites are important because they often contain other rare earth minerals and gemstones, such as aquamarine, tourmaline, topaz, fluorite, apatite, tin, and tungsten, among others.

Granitic pegmatites, boron granitic pegmatites, lithia pegmatites, and boron lithia pegmatites exist.

See also: List of minerals



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
List of Canadian provincial and territorial symbols

... retriever[?] Provincial gemstone: Agate Provincial mineral: Stilbite[?] Maritime ambassador: Bluenose II Provincial motto: Munit haec et altera vincit (One leads and ...