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Volcanic rock of equivalent chemical composition and mineralogy is called rhyolite.
Red granite composition. The rock received its name from german geologist ferdinand von richthofen better known as the red baron a world war i flying ace the word rhyolite comes from the greek word rhýax a stream of lava with the suffix ite given to rocks. The red hue may also be due to contamination of the feldspar with iron oxide. Red granite red granite credit. It forms from the slow crystallization of magma below earth s surface.
Granites are the most abundant plutonic rocks of mountain belts and continental. It may be a type of igneous rock called. Granite is a common and widely occurring group of intrusive felsic igneous rocks that forms at great depths and pressures under continents. Rhyolite is similar in composition and appearance to granite but it forms through a.
Granite is composed mainly of quartz and feldspar with minor amounts of mica amphiboles and other minerals this mineral composition usually gives granite a red pink gray or white color with dark mineral. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye. Despite what you may hear blue granite is unlikely to be true granite. Alkali feldspar granite some varieties of which are called red granite is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar k spar.
The abundance of k spar gives the rock a predominant pink to reddish hue. Granite ˈ ɡ r æ n ɪ t is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. Granites can be predominantly white pink or gray in color depending on their mineralogy the word granite comes from the latin granum a grain in reference to the coarse grained structure of such a completely crystalline rock. It is a dense rock with a phaneritic texture.
The chemical composition of granite is typically 70 77 silica 11 13 alumina 3 5 potassium oxide 3 5 soda 1 lime 2 3 total iron and less than 1 magnesia and titania. Red granite is similar in composition to pink granite except that the potassium feldspar has a darker color than usual.
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