- aplite
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/ap"luyt/, n. Petrol.a fine-grained granite composed essentially of feldspar and quartz.[1875-80; apl- (var. of HAPLO-) + ITE1]
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or hapliteAny igneous rock of simple composition, such as granite composed only of alkali feldspar, muscovite mica, and quartz; in a more restricted sense, uniformly fine-grained (less than 0.08 in., or 2 mm), light-coloured igneous rocks that have a characteristic granular texture.Unlike pegmatite, which is similar but much coarser-grained, aplite occurs in small bodies that rarely contain zones of different minerals. The two rocks may occur together and are assumed to have formed at the same time from similar magmas.* * *
▪ geologyany intrusive igneous rock of simple composition, such as granite composed only of alkali feldspar, muscovite mica, and quartz; in a more restricted sense, uniformly fine-grained (less than 2 millimetres [0.08 inch]), light-coloured, intrusive igneous rocks that have a characteristic granular texture. Unlike pegmatite, which is similar but coarser grained, aplite occurs in small bodies that rarely contain zones of different minerals. The two rocks often occur together, cutting across or forming lenses (thin-edged strata) within each other, and are assumed to have formed at the same time from similar magmas (molten materials). See pegmatite.* * *
Universalium. 2010.