Metamorphic rock is one of the 3 major classes of rock comprising the Earth's crust, the others being SEDIMENTARY and IGNEOUS ROCKS.Metamorphic rock has been transformed, while in the solid state, by pressure, temperature and deformation. The composition of sediments provides us with clues as to the original rock. Metamorphic Rocks Metamorphic rocks are formed when rock changes over a period of time due to a lot of physical changes like pressure, heat and different chemical activity. When sedimentary rocks or igneous rocks go through the physical process such as pressure exposure, heat changes, and tectonic plate movement at plate edges. Image Credit: MBG. They are an important part of our world. Igneous. Parent rock or protolith is the term for the preexisting rock that is metamorphosed. Igneous and sedimentary rocks mainly undergo this change and become metamorphic rocks. Economic Importance of Metamorphic Rocks-what metamorphic rocks are present might be … Minerals weather chemically when they react with air and water. Rocks and minerals are important for learning about earth materials, structure, and systems. Metamorphic Rocks Engineering Properties of ROCKS: Rocks have very much importance in engineering point of view. Basalt. The metamorphic rocks are formed when existing rocks are subjected to such large pressures and temperatures that they are transformed—something that occurs, for example, when continental plates collide. Gabbro. Peridotite. Metamorphic Rock. Importance of Metamorphic rocks SLATES Fine grained impermeable, cleavable and soft Incompetent; cannot withstand great loads But since they are impermeable and split easily; thin large sized slabs of uniform thickness can be extracted for roofing purpose. Such tendency of a rock is called rock cleavage. Metamorphic rocks form as the result of a solid-state transformation of preexisting rocks. Metamorphic rocks have been on Earth for millions of years. Metamorphic Facies: All the rocks that have reached chemical equilibrium under a particular set of physical conditions. Earth Science. Diabase. Rocks are mainly of three types 1. Then color, grain, crystal observations below a magnifying glass will complete the identity technique. Metamorphic rocks are used to make buildings, jewelry, powders, and other things. • Facies represent specific temperature - pressure regimes. Sedimentary rocks form from the lithification (think "rockification") of separate sediments usually through the addition of some type of natural cementing agent. Importance of Metamorphic Rocks-Much of a stable continental core is made up of metamorphic rocks. Quartzite and marble are the most commonly used metamorphic rocks. This contribution explains a preliminary view of the metamorphic rocks from collected rocks sample in the Jiwo Hills. Gneiss, marble, slate, schist and quartzite are some of the different types of metamorphic rocks. Metamorphic rocks form when rocks undergo metamorphosis/changes due to heat and pressure. In fact, more than 22,000 tonnes of marble were used to build the ancient Greek Parthenon and marble remains a popular building and sculpture material today. These are the rocks that form by the effects of heat, pressure, and shear upon igneous and sedimentary rocks. Metamorphic Rocks Metamorphic rocks form when rocks undergo metamorphosis/changes due to heat and pressure. They contain fossils, the preserved remains of ancient plants and animals. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. The Jiwo Hills has been considered to be composed of very low-grade metamorphic rocks. Granite. Rocks and minerals play a valuable role in natural systems such as providing habitat like the cliffs at Grand Canyon National Park where endangered condors nest, or provide soil nutrients in Redwood where the tallest trees in the world grow. Quartzite is very hard and is often crushed and used in building railroad tracks. Sedimentary rocks contain important information about the history of the Earth. Meaning of Rock Cleavage: Certain rocks can get split into thin sheets along closely spaced parallel planes which may be inclined to the bedding planes. By: Alan V. Morgan Continuing our story of the respective rock families we reach the third great group, the metamorphic rocks. The original rock is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (100 megapascals (1,000 bar) or more), causing profound physical or chemical change.The protolith may be a sedimentary, igneous, or existing metamorphic rock. The foliated rocks like slate, gneiss and schist are used as roofing material tabletops, staircases, etc. Engineering Uses of Metamorphic Rocks: The metamorphic rocks are extensively used as building stones. Marble is another one of the metamorphic rocks and is a metamorphosed limestone. Rhyolite. Evidence from the Wellington region, the lower Pareora Gorge, and the Otago schist belt testifies clearly to the importance of lithology in determining response of rocks to metamorphism and tectonic forces. Diorite. • Look at several protoliths to determine facies. The most important non-foliated rock is marble. Metamorphic rocks form when sedimentary or igneous rocks change after being exposed to extreme heat or pressure without melting. The great advantage is that almost all igneous and metamorphic rocks contain sufficient U and Pb for this dating. The sedimentary rocks are formed by diagenesis or lithification of … Marble is used for statues and decorative items like vases (Figure). 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