The Volcanic Fine Grained Compositional Equivalent Of Granite

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The volcanic fine grained compositional equivalent of granite.

Peridotite never contains olivine. Rhyolite lavas are the most common lavas seen at mid ocean ridges. The fine grained equivalent of granite. Gabbro is a major component of the lower oceanic crust.

Mafic rocks are dominated by plagioclase and pyroxene even if you can t see them with the naked eye and smaller amounts of olivine. It is the fine grained compositional equivalent of diorite. This chart illustrates the generalized mineral composition of igneous rocks. Heaton professor of earth sciences university of south dakota.

A vesicular rock also known as cinder. Which rock is the fine grained equivalent of granite. Igneous rocks are classified according to their mineral content. Because mafic lava is more mobile it is less common than basalt.

Gabbro is a coarse grained mafic igneous rock made with mainly mafic minerals like pyroxene and only minor plagioclase. A good example is granite which is a very hard plutonic rock. Moh s scale is. The general physical appearance of a rock as observed in reflected light.

Igneous rocks and volcanoes practice exam questions written by timothy h. The softest mineral on mr. One example of an aphanitic rock with felsic composition. Mauna loa in hawaii is situated on a hot spot.

Its principal minerals are feldspars quartz and mica. Material consisting of rock glass ash and scoria ejected during violent volcanic eruptions. Intermediate rocks are roughly even mixtures of felsic minerals mainly plagioclase and mafic minerals mainly hornblende pyroxene. 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. The countertops in your kitchen might be made of granite as this rock is. 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.