The Volcanic Fine Grained Compositional Equivalent Of Granite

One example of an aphanitic rock with felsic composition.

The volcanic fine grained compositional equivalent of granite.

A good example is granite which is a very hard plutonic rock. Rhyolite lavas are the most common lavas seen at mid ocean ridges. Gabbro is a major component of the lower oceanic crust. Igneous rocks and volcanoes practice exam questions written by timothy h.

Because mafic lava is more mobile it is less common than basalt. Gabbro is the fine grained equivalent to basalt. 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. Ultramafic rocks are dominated by olivine and or pyroxene.

Its principal minerals are feldspars quartz and mica. Igneous rocks are classified according to their mineral content. Therefore plutonic rocks have coarse grained crystals. Mafic rocks are dominated by plagioclase and pyroxene even if you can t see them with the naked eye and smaller amounts of olivine.

The general physical appearance of a rock as observed in reflected light. Moh s scale is. Heaton professor of earth sciences university of south dakota. The fine grained equivalent of granite.

A vesicular rock also known as cinder. Which rock is the fine grained equivalent of granite. It contains more than 68 weight of silica in composition and is granular and coarse grained in texture. You will be told if your answer is correct or not and will be given some comments.

Gabbro is a coarse grained mafic igneous rock made with mainly mafic minerals like pyroxene and only minor plagioclase. Intermediate rocks are roughly even mixtures of felsic minerals mainly plagioclase and mafic minerals mainly hornblende pyroxene. It is the fine grained compositional equivalent of diorite. Peridotite never contains olivine.

The softest mineral on mr. Material consisting of rock glass ash and scoria ejected during violent volcanic eruptions. This chart illustrates the generalized mineral composition of igneous rocks. Granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock.

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