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Pegmatite

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About PegmatiteHide

A term originally suggested by Haüy as a synonym for graphic granite, but later used for the coarse-grained facies of any type of igneous rock.

An exceptionally coarse-grained igneous rock, with interlocking crystals, usually found as irregular dikes, lenses, or veins, esp. at the margins of batholiths. Most grains are 1 cm or more in diameter. Although pegmatites having gross compositions similar to other rock types are known, their composition is generally that of granite; the composition may be simple or complex and may include rare minerals rich in such elements as lithium, boron, fluorine, niobium, tantalum, uranium, and rare earths. Pegmatites represent the last and most hydrous portion of a magma to crystallize and hence contain high concentrations of minerals present only in trace amounts in granitic rocks.


Classification of PegmatiteHide

Sub-divisions of PegmatiteHide

Synonyms of PegmatiteHide

References for PegmatiteHide

Reference List:
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Fisher, D.J. (1958) Pegmatite phosphates and their problems. American Mineralogist, 43, 181-207.
Varlamoff, N. (1958-1959) Zonéographie de quelques champs pegmatitiques de l'Afrique centrale et les classifications de K.A. Vlassov et de A.I. Guinsbourg. Annales de la Société géologique de Belgique, 82, B55-B87.
Moore, P.B. (1982) Pegmatite minerals of P(V) and B(III). In Cerný, P. (ed.) (1982) Short course in granitic pegmatites in science and industry. Mineralogical Association of Canada, Short Course Handbook, 8, 267-291.
Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press.
Fransolet, A.-M. (2007) Phosphate associations in the granitic pegmatites: the relevant significance of these accessory minerals. Granitic Pegmatites: The State of the Art - International symposium. 06th-12th May 2007, Porto, Portugal.

Internet Links for PegmatiteHide

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