The Volcanic Fine Grained Compositional Equivalent Of Granite

It consists of the plagioclase feldspar minerals andesine and oligoclase together with one or more dark ferromagnesian minerals such as pyroxene and biotite.

The volcanic fine grained compositional equivalent of granite.

Material consisting of rock glass ash and scoria ejected during violent volcanic eruptions. One example of an aphanitic rock with felsic composition. 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. An ultralight felsic vesicular rock.

The fine grained equivalent of granite. Intermediate in silica content it is usually gray in color and may be fine grained or porphyritic. Andesite and diorite likewise refer to extrusive and intrusive intermediate rocks with dacite and granodiorite applying to those rocks with composition between felsic and intermediate. It contains more than 68 weight of silica in composition and is granular and coarse grained in texture.

Andesite is the volcanic equivalent of diorite. Friman wikimedia commons granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock. The fine grained volcanic equivalent of granite is basalt. Its principal minerals are feldspars quartz and mica.