a coarsely crystallized rock commonly occurring in igneous intrusions esp dykes and consisting mainly of feldspar and quartz
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pegmatitea coarsely crystallized rock commonly occurring in igneous intrusions, esp dykes, and consisting mainly of feldspar and quartz
pegmatitesPEGMATITE, a coarsely crystallized rock commonly occurring in igneous intrusions, esp dykes, and consisting mainly of feldspar and quartz