Photos of common Foliated and also Non-Foliated Metamorphic absent TypesArticle by: Hobart M. King, PhD, RPG
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Amphibolite is a non-foliated metamorphic rock that forms through recrystallization under problems of high viscosity and directed pressure. It is composed mostly of hornblende (amphibole) and plagioclase, usually v very small quartz. The specimen shown above is about two customs (five centimeters) across.

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What room Metamorphic Rocks?

Metamorphic rocks have been modified by heat, pressure, and also chemical processes, typically while hidden deep listed below Earth"s surface. Exposure to this extreme problems has altered the mineralogy, texture, and also chemical ingredient of the rocks.

There space two simple types that metamorphic rocks. Foliated metamorphic rocks have a layered or banded appearance the is produced by exposure come heat and directed pressure. Examples of foliated rocks include: gneiss, phyllite, schist, and slate

Non-foliated metamorphic rocks do not have actually a layered or banded appearance. Instances of nonfoliated rocks include: hornfels, marble, novaculite, quartzite, and skarn.

Photographs and also brief descriptions of part common species of metamorphic rocks are shown on this page.


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Gneiss is a foliated metamorphic rock that has a banded appearance and also is comprised of granular mineral grains. It frequently contains numerous quartz or feldspar minerals. The specimen shown over is around two inches (five centimeters) across.


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Anthracite is the highest rank of coal. It has been exposed to sufficient heat and also pressure that most of the oxygen and also hydrogen have been moved off, leave a high-carbon material behind. It has a bright, lustrous appearance and also breaks v a semi-conchoidal fracture. It is frequently referred to as "hard coal"; however, this is a layman"s term and also has little to execute with the hardness the the rock. The specimen shown over is around two customs (five centimeters) across.


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Hornfels is a fine-grained nonfoliated metamorphic rock with no details composition. It is created by contact metamorphism. Hornfels is a rock the was "baked" while near a heat resource such together a magma chamber, sill, or dike. The specimen shown above is around two customs (five centimeters) across.


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Marble is a non-foliated metamorphic rock that is created from the metamorphism of limestone or dolostone. It is composed mostly of calcium carbonate. The specimen shown above is around two inch (five centimeters) across.


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Novaculite is a dense, hard, fine-grained, siliceous rock that breaks through a conchoidal fracture. It forms from sediments deposit in marine settings where biology such as diatoms (single-celled birds that secrete a hard shell composed of silicon dioxide) are plentiful in the water. The specimen shown above is around three inch across.


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Mariposite is a word that has actually been offered in plenty of ways. It can refer to green mica minerals, or metamorphic rocks that contain sufficient green mica to send a environment-friendly color. Gold prospectors learned the gold might be discovered in locations where these green rocks to be present. This is because mariposite is one ore the gold.


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Quartzite is a non-foliated metamorphic rock that is created by the metamorphism of sandstone. That is composed mostly of quartz. The specimen over is around two inch (five centimeters) across.


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Phyllite is a foliated metamorphic rock that is comprised mainly of really fine-grained mica. The surface of phyllite is frequently lustrous and also sometimes wrinkled. The is intermediary in grade in between slate and schist. The specimen shown over is about two inch (five centimeters) across.


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Skarn is a rock characterized by its development rather than its mineral composition. The often creates when lead carbonate rocks close to a magma human body are changed by call metamorphism and also metasomatism. Miscellaneous minerals, gems, and also even precious metals deserve to sometimes be discovered in skarn.


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Schist is a metamorphic rock through well-developed foliation. It frequently contains far-ranging amounts of mica which enable the absent to split into slim pieces. That is a rock of intermediary metamorphic grade in between phyllite and gneiss. The specimen shown above is a "chlorite schist" because it consists of a far-reaching amount the chlorite. That is about two inches (five centimeters) across.


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Soapstone is a metamorphic absent that is composed primarily of talc through varying amounts of other minerals such together micas, chlorite, amphiboles, pyroxenes, and also carbonates. The is a soft, dense, heat-resistant rock that has a high particular heat capacity. These properties do it helpful for a wide variety of architectural, practical, and also artistic uses.


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Slate is a foliated metamorphic rock the is formed through the metamorphism of shale. The is a low-grade metamorphic rock the splits into thin pieces. The specimen shown above is about two customs (five centimeters) across.


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The best way to learn about rocks is to have a collection of specimens to study while girlfriend study. Seeing and also handling the rocks will aid you recognize their composition and texture much far better than reading around them ~ above a website or in a book. The centregalilee.com store offers inexpensive absent collections that deserve to be mailed everywhere in the United says or U.S. Territories. Mineral collections and instructive publications are additionally available.


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