aplite

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light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars

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However, as documented by Cherry and Trembath (1978), the granitic rocks in the Lake Utopia area are homogeneous, equigranular, and medium--to coarse-grained, whereas those in the Mount Douglas area are heterogeneous consisting of about 65% equigranular, medium-to coarse-grained phase and about 35% finegrained porphyritic and aplitic phases.
2), aplitic dikes (mainly towards the contact) and and esite-dacite dikes intruding the stock and the EtpanaMetamorphic Suite.
Many of these plutons, regardless of age, share characteristics such as the occurrence of pegmatite pods that locally contain tourmaline or beryl, garnetiferous aplitic dykes, and inclusions or enclaves of paragneiss ranging in size from small xenoliths to large roof pendants.
These rocks were cut by small dykes of granitic and aplitic rocks showing a range of texture and composition.
It is composed of gneiss and mica schists, higher from mica schists and phyllites, in both cases with localization of aplitic granitoides, cataklastic granites and ampihibolites, with isolated erlans.
Because zeolites are indicative of relatively low-temperature environments, their widespread occurrence in the high-grade metamorphic terrain of the Grenville may appear suiprising, though thomsonite has been reported elsewhere from altered aplitic dykes, pegmatites and fractures in gneiss (Gottardi et al.
Numerous aplitic leucogranite dykes ranging from 40 cm to 5 m in width, occur on the property, mostly within the schist.
Geologically the region lies on the northern margin of the Gotthard massif, characterized by crystalline granite and granodiorite; the hematite clefts occur most abundantly of all in aplitic granite gneiss.
Cross joints are of the direction 20[degrees]-30[degrees] which is followed also by pegmatitic and aplitic dykes.