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Feb 24, 2024 · Learn how metamorphic rocks form from other rocks under extreme conditions of heat, pressure, and fluids. Explore the common examples, properties, and processes of metamorphism with Science Notes.
- Andrew Alden
- Amphibolite. Amphibolite is a rock composed mostly of amphibole minerals. Usually, it's a hornblende schist like this as hornblende is the commonest amphibole.
- Argillite. This is the rock name to remember when you find a hard, nondescript rock that looks like it could be slate but doesn't have slate's trademark cleavage.
- Blueschist. Blueschist signifies regional metamorphism at relatively high pressures and low temperatures, but it isn't always blue, or even a schist. High-pressure, low-temperature conditions are most typical of subduction, where marine crust and sediments are carried beneath a continental plate and kneaded by changing tectonic motions while sodium-rich fluids marinate the rocks.
- Cataclasite. Cataclasite (kat-a-CLAY-site) is a fine-grained breccia produced by grinding rocks into fine particles, or cataclasis. This is a microscopic thin section.
Oct 19, 2023 · Rocks that undergo a change to form a new rock are referred to as metamorphic rocks. In the rock cycle , there are three different types of rocks: sedimentary, igneous, and metamorphic. Sedimentary and igneous rocks began as something other than rock.
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Amphibolite is a non-foliated metamorphic rock that forms through recrystallization under conditions of high viscosity and directed pressure. It is composed primarily of hornblende (amphibole) and plagioclase, usually with very little quartz. The specimen shown above is about two inches (five centimeters) across. Gneiss is a foliated metamorphic ro...
Lapis Lazuli, the famous blue gem material, is actually a metamorphic rock. Most people are surprised to learn that, so we added it to this photo collection as a surprise. Blue rocks are rare, and we bet that it captured your eye. The round objects in the photo are lapis lazuli beads about 9/16 inch (14 millimeters) in diameter. Image copyright iSt...
Phyllite is a foliated metamorphic rock that is made up mainly of very fine-grained mica. The surface of phyllite is typically lustrous and sometimes wrinkled. It is intermediate in grade between slate and schist. The specimen shown above is about two inches (five centimeters) across.
The best way to learn about rocks is to have a collection of specimens to examine while you study. Seeing and handling the rocks will help you understand their composition and texture much better than reading about them on a website or in a book. The Geology.com store offers inexpensive rock collections that can be mailed anywhere in the United Sta...
Learn about different types of metamorphic rocks with photos and descriptions. See examples of foliated and non-foliated metamorphic rocks, such as gneiss, marble, slate, and soapstone.
May 15, 2024 · Metamorphic rock is a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions. Learn about the types, causes, and examples of metamorphic rocks, such as slate, gneiss, and marble, and how they reflect Earth's geologic history.
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The study of metamorphic rocks (now exposed at the Earth's surface following erosion and uplift) provides information about the temperatures and pressures that occur at great depths within the Earth's crust. Some examples of metamorphic rocks are gneiss, slate, marble, schist, and quartzite.
Metamorphic rocks are rocks that have changed from their original form due to heat, pressure, or fluids. Learn about the process of metamorphism, the types of metamorphic rocks, and some examples of common metamorphic rocks.
