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\u00a9 2021 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous , sedimentary , or earlier metamorphic form. This alignment may be displayed as parallel planes along which the rock splits, by overlapping sheets of platy minerals such as micas, by the parallel alignment of elongate minerals such as amphiboles, or by alternating layers of light and dark minerals. Metamorphic Rocks. Sedimentary rocks with no grains also tend to be soft, as they can usually be scratched easily with a … They occur when sedimentary and igneous rocks become changed, or metamorphosed, by conditions underground. The first step involves determining the texture of your unknown rock sample. By studying metamorphic rocks, scientists can gain insight into the conditions inside the Earth during the metamorphic process. Geology rock and mineral identification. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination … 61 terms. By signing up you are agreeing to receive emails according to our privacy policy. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\n<\/p><\/div>"}, https://www.oakton.edu/user/4/billtong/eas100lab/metrxsum.htm, http://www.appstate.edu/~abbottrn/rck-id/mtmchrt.html, https://www.usgs.gov/faqs/what-are-metamorphic-rocks-0, https://csmgeo.csm.jmu.edu/geollab/Fichter/MetaRx/metkeyvrysp.html, http://www.minsocam.org/msa/collectors_corner/id/rock_key.htm#3, consider supporting our work with a contribution to wikiHow. The rock also has a strong slaty foliation, which is horizontal in this view, and has developed because the rock was being squeezed during metamorphism. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Nonfoliated textures are further described on the basis of the grain (crystal) size in the rock. Metamorphic rocks are formed from other rocks that are changed because of heat or pressure. Other kinds of metamorphic rock are named for the kinds of minerals present, the size of the grains and other textures. Determining Whether a Rock is Metamorphic 1 Hold the rock to the light and see if it has a shine or shimmer. They come in various colors and often contain glittery mica. Organic sedimentary rocks are easy to identify because most contain fossils. During this long process of change, new minerals grow from the chemicals in the old rocks, forming new rocks. Although different rocks can contain the same minerals, they are classified on how they were formed, and as we know metamorphic rocks from when they are exposed to heat and pressure deep in the Earth’s surface. Rocks under the Microscope. Marble can vary widely in color, but the most common colors are white and grey. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Grain Size: Coarse grains are visible to the naked eye, and the minerals can usually be … Use these tips to identify metamorphic rocks. FINAL ENV. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This large boulder has bedding still visible as dark and light bands sloping steeply down to the right. Learn more... Metamorphic rocks are formed through immense pressure and heat below the surface of the earth. Foliated texture is further subdivided based on the presence or absence of pronounced color banding in the rock. The stripes or bands may be difficult to see, so be sure to look closely for any directions that crystals seem to be oriented in. Not all metamorphic rocks have luster or shiny grains. Metamorphism (meta = change, morph = form) happens when molten rock intrudes other rocks and bakes the contact zone where the molten rock touches the preexisting rock. Start by identifying and list all visible minerals present in the rock. % of people told us that this article helped them. If the grains seem to be organized more heavily in one are than another, or seem to “flow” evenly around the rock, it is likely metamorphic. Shale. Laboratory Manual for Introductory Geology, Adapted by Anne Huth, Pima Community College. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Metamorphic rock is classified by texture and composition. Next, check the rock's grain size and hardness. For example, mica schist has very thin layers of mica, and garnet gneiss (pronounced like nice) has garnet crystals in thick layers of quartz and feldspar. The amount of time, amount of pressure, and highness of temperature determine what types of metamorphic rocks are made. Step 1. Common foliated metamorphic rocks include slate, phyllite, and gneiss. Extreme pressure or heat can squeeze or cook rocks so much that they change their character, turning into metamorphic rocks. Biostatistics Hypothesis Testing. The texture can be foliated or nonfoliated. OCEANOGRAPHY CH 15 VOCAB. Igneous. Figure 7.7 shows an example of this effect. :P Metamorphic rocks are formed as another rock is deformed and recrystallizes through heat and/or pressure. Examine your rock and CLICK on the appropriate texture to move to the next identification step. Rocks are made of minerals. Metamorphic rocks are rocks that have undergone a change from their original form due to changes in temperature, pressure or chemical alteration. 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