The Volcanic Fine Grained Compositional Equivalent Of Granite

Material consisting of rock glass ash and scoria ejected during violent volcanic eruptions.

The volcanic fine grained compositional equivalent of granite. Andesite is the volcanic equivalent of diorite. The fine grained volcanic equivalent of granite is basalt. It consists of the plagioclase feldspar minerals andesine and oligoclase together with one or more dark ferromagnesian minerals such as pyroxene and biotite. Granites and rhyolites compositionally equivalent to granite but of a fine grain size are composed mainly of orthoclase feldspar quartz plagioclase feldspar mica and amphibole.

This chart illustrates the generalized mineral composition of igneous rocks. The fine grained equivalent of granite. Intermediate in silica content it is usually gray in color and may be fine grained or porphyritic. Friman wikimedia commons granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock.

It contains more than 68 weight of silica in composition and is granular and coarse grained in texture. One example of an aphanitic rock with felsic composition. Rhyolite refers to the volcanic and felsic igneous rocks and granite refer to intrusive and felsic igneous rocks. An ultralight felsic vesicular rock.