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pegmatitePEG'MATITE, n. Primitive granitic rock, composed essentially of lamellar feldspar and quartz; frequently with a mixture of mica. In it are found kaolin, tin tourmaline, beryl, aqua marina, tantale, scheelin and other valuable minerals. |
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pegmatitePEG'MATITE, n. Primitive granitic rock, composed essentially of lamellar feldspar and quartz; frequently with a mixture of mica. In it are found kaolin, tin tourmaline, beryl, aqua marina, tantale, scheelin and other valuable minerals. |