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Classification Of Igneous Rocks By {Group 2:} Miguel Rivas, Jaden Sears, Azra Gomez, and Josh Hugill Types Of Igneous Rocks Coarse Grained Rocks If the magma cools slowly then it will convert into an igneous rock with a coarse grained texture Fine Grained Rocks If the magma cools fast then you can get a fine coarse rock Glassy Textured Rock If lava spews onto the earth's surface it can make the atoms arrange themselves into a network of crystals Fun Fact: The rate of cooling affects the textures of the rock. Coarse grained rocks This rock makes up most of the earth The elements in the magma directly affect which minerals are formed when the magma cools. If the magma cools slowly enough, a few centers of crystal growth happen. You can even get a coarse grain texture that allows charged atoms to move large distances in the magma. Fine Grained Rocks When the magma cools quickly the ions in the melted material lose their motion and quickly combine. When it cools fast it makes rocks with small, interconnected mineral grains. Glassy Texture Igneous Rock has a very glassy texture. It is from when a volcanic eruption is quenched so rapidly that crystallization cannot occur. So the solids produced this way are made of randomly distributed ions.The result is their current glassy or vitreous texture. Granitic Composition Granitic composition are composed of light sillitates. The rock is a light color because of the 2 other minerals that make it up- quartz and feldspar Quartz Most granitic rocks have 10% dark silicate minerals and ~70% silica. Formed from magma that contained a lot of silica . Granite is one form of this. feldspar Basaltic Composition Rocks with many dark silicate minerals and plagioclase feldspar have a basaltic competition.Basaltic rocks are rich in magnesium and iron, most basaltic rocks are darker and denser because of their iron content. Porphyritic Texture -Large bodies in Earth take a while to harden -1000 years -Minerals from this don’t form at the same rate or time -Results in large crystals -They have porphyritic texture Other Compositional Groups -Rocks with composition between granitic and basaltic -have an andesitic composition Named after andesite -Ultramafic composition: composed of dark silicate minerals Shelby Not shelby