Classifying Rocks Essay -- Geology Geological Rock Essays Papers

Classifying RocksRocks be classified to make it easier on quite a little to identify them in the future. This can be done by a numerous amount of ways. Each rock type has their own ad hoc ways, but there be devil distinct characteristics that apply to all. These argon texture and composition. These two, along with many others helps to classify igneous, sedimentary, and metamorphic rocks.Igneous rocks are classified first by texture. This is broken down mainly into atom size. First there are intrusive, or plutonic igneous rocks. These types of rocks chill out within the crust and forms large, visible crystals. The opposite would be extrusive, or volcanic rocks. These cool at the surface rapidly, forming small grains. A combination of the two would be porphyritic, large grains in an aphanitic, or extrusive matrix. Secondly, composition is apply to classify igneous rocks. There are four types, ultramafic, mafic, intermediate, and felsic. Ultramafic rocks are rattling dark and contain and extreme amount of press and magnesium. Mafic rocks are in addition dark in color they too contain high iron and magnesium amounts. An example would be olivine, or pyroxene. Intermediate igneous rocks are made from silica and plagioclase. They tend to be grays and browns in color. Finally, felsic socks are coruscation in color and contains high amounts of silica. Quartz and potassium feldspar are examples of felsic igneous rocks. Other types of rocks are classified similarly.Sedimentary rocks form...