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pegmatiidid on jämedateralised kivimid, koosnevad peamiselt kvartsist, päevakivist ja vilgust ning on tähtsad, kuna nad sisaldavad haruldasi muldmineraale ja vääriskive, nagu akvamariin, turmaliin, topaas, fluoriit, apatiit ja korund, sageli koos tina ja volframi mineraalidega.
pegmatites are coarse-grained rocks, mainly composed of quartz, feldspar and mica and are important because they often contain rare earth minerals and gemstones, such as aquamarine, tourmaline, topaz, fluorite, apatite and corundum, often along with tin and tungsten minerals, among others.
