| pegmatite | <chemical> Graphic granite. See Granite. More generally, a coarse granite occurring as vein material in other rocks. Origin: From Gr. Something fastened together, in allusion to the quartz and feldspar in graphic granite: cf. F. Pegmatite. See Pegm. Source: Websters Dictionary (01 Mar 1998) |
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| pegmatite | a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements |
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