1) Igneous rock 2) Igneous rock
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https://www.crosswordclues.com/clue/pegmatite
A pegmatite is a holocrystalline, intrusive igneous rock composed of interlocking phaneritic crystals usually larger than 2.5 cm in size; such rocks are referred to as pegmatitic. Most pegmatites are composed of quartz, feldspar and mica, having a similar basic composition as granite. Rarer intermediate composition and mafic pegmatites containing ...
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http://en.wikipedia.org/wiki/Pegmatite
an igneous rock, rich in quartz and feldspar with very large grains, indicating slow cooling
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http://gemologyproject.com/wiki/index.php?title=Glossary_of_Terms
• (n.) More generally, a coarse granite occurring as vein material in other rocks. • (n.) Graphic granite. See under Granite.
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http://thinkexist.com/dictionary/meaning/pegmatite/
almost any wholly crystalline igneous rock that is at least in part very coarse grained, the major constituents of which include minerals typically ... [5 related articles]
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http://www.britannica.com/eb/a-z/p/35
A coarse-grained igneous rock with exceptionally large crystals, formed from a magma that contains a high proportion of water.
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http://www.encyclo.co.uk/local/22291
A very coarse grained igneous rock, normally of granitic composition. Typically forms during the fin
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http://www.encyclo.co.uk/local/22392
Peg'ma·tite noun [ From Greek ... something fastened together, in allusion to the quartz and feldspar in graphic granite: confer French
pegmatite . See
Pegm .]
(Min.) (a) Graphic granite. See under
Granite .
(b) More generally, a coarse granite occurring as...
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http://www.encyclo.co.uk/webster/P/43
Pegmatite is a variety of extremely coarse-grained igneous rock chemically similar to and closely associated with granite. The mineral constituents of
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http://www.probertencyclopaedia.com/browse/HP.HTM
An igneous rock with extremely large grains, more than a centimeter in diameter. It may be of any composition but most frequently is granitic.
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http://www.scientificpsychic.com/etc/geology-glossary.html
[
n] - a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
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http://www.webdictionary.co.uk/definition.php?query=pegmatite
any exceptionally coarse-grained igneoid rock, typically occurring as lenses or irregular masses that consist largely of quartz, alkali feldspar, and mica; the adjective pegmatitic is sometimes applied to coarse grained igneoid rocks no matter what their composition.
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https://www.encyclo.co.uk/local/20132
noun a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
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https://www.encyclo.co.uk/local/20974
Extremely coarse-grained igneous rock of any composition found in veins; pegmatites are usually associated with large granite masses
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https://www.encyclo.co.uk/local/21221
A coarse-grained igneous rock composed of feldspar mica, and quartz, that is formed deep within the earth's crust. Pegmatite rock is usually associated with Apitite, Aquamarine, Beryl, Topaz, Tourmaline, and Quartz.
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https://www.encyclo.co.uk/local/22070
An extremely coarse-grained igneous rock with interlocking crystals, usually with a bulk chemical composition similar to granite but commonly containing rare minerals enriched in lithium, boron, fluorine, niobium, and other scarce metals. Pegmatites are also the source for many gem-quality precious and semiprecious stones.
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https://www.encyclo.co.uk/local/22327
A coarse-grained, igneous rock, generally coarse but irregular in texture and similar to a granite in composition; it usually occurs in dykes or veins and sometimes contains valuable minerals.
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https://www.encyclo.co.uk/local/22734
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