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pegmatite |
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pegmatite: see granite granite, coarse-grained igneous rock of even texture and light color, composed chiefly of quartz and feldspars. It usually contains small quantities of mica or hornblende, and minor accessory minerals may be present. ..... Click the link for more information. . pegmatiteAlmost any wholly crystalline igneous rock that is at least in part very coarse-grained, the major constituents of which include minerals typically found in ordinary igneous rocks (such as granites) and in which extreme textural variations, especially in grain size, are characteristic. Usually found as irregular dikes, lenses, or veins, pegmatite deposits occur in all parts of the world and are the chief source of commercial feldspar, sheet mica, and beryllium, tantalum-niobium, and lithium minerals. pegmatite [′peg·mə‚tīt] (petrology) Any extremely coarse-grained, igneous rock with interlocking crystals; pegmatites are relatively small, are relatively light colored, and range widely in composition, but most are of granitic composition; they are principal sources for feldspar, mica, gemstones, and rare elements. Also known as giant granite; granite pegmatite. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Again, London and Evensen (2002) state, "It may seem logical that, as likely sources of the beryl-rich pegmatitic melts, these granites are themselves depleted in Be and other incompatible components. Recent Exploration by Newmac to the east and southeast of the focus of previous exploration efforts on the property in the 1960's to early 80's has revealed a somewhat clustered group of newly discovered molybdenite occurrences which include localized high grade mineralization in pegmatitic sections. Textures change from highly vesicular (upper 5 m), to pegmatitic at depths of ~30 m (Greenough et al. |
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