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Pegmatite   /pˈɛgmətˌaɪt/   Listen
Pegmatite

noun
1.
A form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements.





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"Pegmatite" Quotes from Famous Books



... masses, which are of cylindrical form, parallelopipedons rounded on the edge, or balls of 40 to 50 feet in diameter, are the effect of a slow decomposition, or of a violent and instantaneous upheaving. The granite of the south-eastern part of Sierra Parime sometimes passes to pegmatite,* composed of laminary felspar, enclosed in curved masses of crystalline quartz. (* Schrift-granit. It is a simple modification of the composition and texture of granite, and not a subordinate layer. It must not be confounded with ...
— Equinoctial Regions of America V3 • Alexander von Humboldt


Words linked to "Pegmatite" :   igneous rock, samarskite


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