The Volcanic Fine Grained Compositional Equivalent Of Granite

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 volcanic fine grained compositional equivalent of granite.

Gabbro is the fine grained equivalent to basalt. Igneous rocks and volcanoes practice exam questions written by timothy h. 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. Granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock.

A good example is granite which is a very hard plutonic rock. Gabbro is a major component of the lower oceanic crust. Peridotite never contains olivine. One example of an aphanitic rock with felsic composition.

This chart illustrates the generalized mineral composition of igneous rocks. You will be told if your answer is correct or not and will be given some comments. Because mafic lava is more mobile it is less common than basalt. The countertops in your kitchen might be made of granite as this rock is.

Ultramafic rocks are dominated by olivine and or pyroxene. Moh s scale is. Igneous rocks are classified according to their mineral content. It is the fine grained compositional equivalent of diorite.

Gabbro is a coarse grained mafic igneous rock made with mainly mafic minerals like pyroxene and only minor plagioclase. Mauna loa in hawaii is situated on a hot spot. Rhyolite lavas are the most common lavas seen at mid ocean ridges. It contains more than 68 weight of silica in composition and is granular and coarse grained in texture.

Therefore plutonic rocks have coarse grained crystals. Intermediate rocks are roughly even mixtures of felsic minerals mainly plagioclase and mafic minerals mainly hornblende pyroxene. Material consisting of rock glass ash and scoria ejected during violent volcanic eruptions. The fine grained equivalent of granite.

The rock that is the fine grained equivalent of granite is. Click the circle by an answer with the mouse then click on the submit button to get a response. The general physical appearance of a rock as observed in reflected light. The softest mineral on mr.

Heaton professor of earth sciences university of south dakota.