Photos of common Foliated and Non-Foliated Metamorphic absent TypesArticle by: Hobart M. King, PhD, RPG
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Amphibolite is a non-foliated metamorphic rock that develops through recrystallization under conditions of high viscosity and directed pressure. That is composed generally of hornblende (amphibole) and plagioclase, usually through very tiny quartz. The specimen shown over is around two inches (five centimeters) across.

You are watching: Marble is a _____ metamorphic rock.


What are Metamorphic Rocks?

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

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

Non-foliated metamorphic rocks carry out not have a layered or banded appearance. Examples of nonfoliated rocks include: hornfels, marble, novaculite, quartzite, and also skarn.

Photographs and also brief explanation of some common species of metamorphic rocks are displayed on this page.


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Gneiss is a foliated metamorphic absent that has a banded appearance and is consisted of of granular mineral grains. It generally contains numerous quartz or feldspar minerals. The specimen shown above is about two customs (five centimeters) across.


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Anthracite is the highest rank the coal. It has actually been exposed to sufficient heat and also pressure that many of the oxygen and also hydrogen have actually been thrust off, leave a high-carbon product behind. It has a bright, lustrous appearance and breaks through a semi-conchoidal fracture. That is regularly referred to together "hard coal"; however, this is a layman"s term and also has tiny to do with the hardness the the rock. The specimen shown above is around two customs (five centimeters) across.


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Hornfels is a fine-grained nonfoliated metamorphic rock through no specific composition. It is produced by call metamorphism. Hornfels is a rock that was "baked" while close to a heat resource such together a magma chamber, sill, or dike. The specimen shown over is about two inch (five centimeters) across.


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Marble is a non-foliated metamorphic rock the is developed from the metamorphism of limestone or dolostone. It is composed generally of calcium carbonate. The specimen shown above is about two inches (five centimeters) across.


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Novaculite is a dense, hard, fine-grained, siliceous rock the breaks v a conchoidal fracture. It develops from sediments deposit in marine settings where organisms such together diatoms (single-celled algae that secrete a tough shell written of silicon dioxide) are plentiful in the water. The specimen shown above is about three customs across.


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Mariposite is a word that has been offered in countless ways. It deserve to refer to environment-friendly mica minerals, or metamorphic rocks that contain sufficient green mica to send a green color. Gold prospectors learned the gold might be found in areas where these eco-friendly rocks were present. This is due to the fact that mariposite is an ore that gold.


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Quartzite is a non-foliated metamorphic rock the is produced by the metamorphism that sandstone. It is composed primarily of quartz. The specimen above is about two inch (five centimeters) across.


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Phyllite is a foliated metamorphic rock the is comprised mainly of very fine-grained mica. The surface ar of phyllite is typically lustrous and also sometimes wrinkled. That is intermediate in grade between slate and also schist. The specimen shown above is around two inches (five centimeters) across.


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Skarn is a rock defined by its development rather 보다 its mineral composition. The often develops when lead carbonate rocks near a magma human body are transformed by contact metamorphism and also metasomatism. Various minerals, gems, and even valuable metals have the right to sometimes be discovered in skarn.


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Schist is a metamorphic rock with well-developed foliation. It frequently contains significant amounts the mica which enable the rock to break-up into slim pieces. The is a absent of intermediary metamorphic grade in between phyllite and gneiss. The specimen shown over is a "chlorite schist" because it contains a far-reaching amount the chlorite. That is around two inch (five centimeters) across.


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Soapstone is a metamorphic rock that consists primarily that talc with varying quantities of other minerals such as micas, chlorite, amphiboles, pyroxenes, and carbonates. That is a soft, dense, heat-resistant absent that has a high certain heat capacity. These properties do it beneficial for a wide variety of architectural, practical, and artistic uses.


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


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The best way to learn about rocks is to have actually a arsenal of specimens to research while friend study. Seeing and handling the rocks will help you know their composition and also texture much far better than reading about them ~ above a website or in a book. The betterworld2016.org store supplies inexpensive rock collections that can be mailed almost everywhere in the United says or U.S. Territories. Mineral collections and instructive publications are also available.


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