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aplite

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aplite

 or haplite

Any 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.


aplite [′a‚plīt]
(petrology)
Fine-grained granitic dike rock made up of light-colored mineral constituents, mostly quartz and feldspar; used to manufacture glass and enamel.


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[FIGURE 3 OMITTED] RAPAKIVI GRANITE TYPES AND WEATHERING ON OUTCROPS The Wiborg rapakivi granite batholith consists of five granite types: wiborgite, pyterlite, even-grained granite, porphyritic granite, and porphyry aplite (Fig.
Near Asbestos, he recognized that the peridotite, chromite-beating dunite, pyroxenite, gabbro, diabase, porphyrite, hornblende granite, and aplite are all parts of a thick sill.
I haven't had it checked, but I am assuming that the rock is of a quickly cooled granitic type, possibly aplite because of the fine crystal size.
 
 
 
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