The essential components of aplites are quartz and alkali feldspar ( the latter usually orthoclase or microperthite ), microcline and albite.
22.
This may be seen in many granite intrusions where later aplite veins form a late-stage stockwork through earlier phases of the granite mass.
23.
These granitic rocks consist predominantly of quartz monzonite and granodiorite with local, minor, scattered bodies of granite, aplite, diorite and gabbro.
24.
If the pipe is volcanic, as some have suggested, then the rock filling it ( the " pseudo-aplite " ) is peculiar in the extreme.
25.
The occasional appearance of myrmekite ( mainly in the microgranites ) and the hematitization of the plagioclase in the aplites and in the red facies rocks points to metasomatic processes.
26.
These rocks consist of gneiss, and gneissic diorite and quartz diorite, intruded by irregular bodies of equigranular granitic rocks, predominantly quartz diorite and granodiorite, with accompanying pegmatite and aplite.
27.
Aplite and veins may intrude pegmatites and wall rocks adjacent to intrusions, creating a confused sequence of felsic intrusive apophyses ( thin branches or offshoots of igneous bodies ) within the aureole of some granites.
28.
Phenocrysts of feldspar occur occasionally and of quartz more seldom; but the relation of aplite to quartz-porphyry, granophyre and felsite is very close, as all these rocks have nearly the same chemical composition.
29.
Major port cargo include tobacco, tobacco products, textiles, newsprint, wastepaper, chemicals, steel, steel products, phosphates, forest products, machinery, project cargo, refractory, vehicles, pharmaceuticals, aplite and livestock.
30.
Located between the Chaparral Shear Zone on the south and the Mesa Butte Shear Zone on the north, there are light-colored granites ( Aplite to Granodiorite ), Diorite, Gabbro, Gneisses, Schists, Metasedimentary and Metavolcanic rocks.
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