Metamorphic Rocks Type, Formation, Classification & Uses

Amphibolite Rock Type, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:33:11 +0000

Amphibolite is a dark-colored, weekly-foliated metamorphic rock that contains plagioclase feldspar and amphibole of the hornblende group. The amphibole is usually green, brown, or black. The rock may also contain metamorphic minerals like garnet, wollastonite, andalusite, staurolite, kyanite, biotite, epidote, and sillimanite. Quartz, magnetite, and calcite are also present in trace amounts in some rocks. ... Read more

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Gneiss Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:32:51 +0000

Gneiss is a common and widely distributed foliated metamorphic rock. It is identified by its bands and lenses of varying mineral composition. Some bands may contain granular minerals bound together in an interlocking texture. Some bands show a parallel orientation with overall banding in the rock because of elongated minerals. Gneiss rock’s texture is defined ... Read more

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Hornfels Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:31:58 +0000

Hornfels is a non-foliated and very fine-grained metamorphic rock with a variable composition. It is a very hard rock with a mottled brownish color. It is usually found adjacent to igneous intrusion sites at shallow depths. The word Hornfels is often used as a group name for a set of contact metamorphic rocks that have ... Read more

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Lapis Lazuli Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:31:51 +0000

Lapis Lazuli, or lapis, is one of the oldest spiritual stones known to mankind. It has been used by healers, priests, royalty, and elites for power, wisdom, and to achieve the inner vision. It is also used for calmness, tranquility, stress relief, and serenity. It is a blue metamorphic rock used as a gemstone, sculpturing ... Read more

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Marble Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:31:42 +0000

Marble is a non-foliated metamorphic rock frequently used worldwide in various applications. Very few rocks have so many uses as marbles. Marbles are used in homes, buildings, construction, roads, sculpting, cemetery markers, and even agriculture. Rock Composition Marble is mostly composed of the mineral calcite (CaCO3) and usually has minerals like clay minerals, micas, quartz, ... Read more

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Mariposite Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:31:13 +0000

The word Mariposite is often used to identify green micas colored by small amounts of chromium. Mariposite is also used to name a group of green and white metamorphic rocks with high mica content. It is interesting to know that the term “Mariposite” has been used interchangeably in different contexts since the 1800s. Moreover, mariposite ... Read more

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Novaculite Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Mon, 28 Nov 2022 06:21:37 +0000

Novaculite is a unique metamorphic rock native to only the Ouachita Mountains of Arkansas and Oklahoma. It is also known as Arkansas Novaculite, and the people of Arkansas have used it for centuries. American Indians in these regions used Novaculite as a primary raw material for making sharp-edged tools. It was obtained from outcrops on ... Read more

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Schist Rock Type, Composition, Formation, & Uses

Tammy — Fri, 18 Nov 2022 13:07:19 +0000

Schist is a foliated metamorphic rock composed of plate-shaped mineral grains. The mineral grains are large enough to be seen with the human eye because the rock has been exposed to regional metamorphism. Rock Composition Schists are very interesting rocks. It is not necessary for specific minerals to be present in a rock to be ... Read more

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Skarn Rock Type, Composition, Classification, Occurrence & Uses

Tammy — Fri, 18 Nov 2022 13:04:58 +0000

Skarn is a non-foliated metamorphic rock created by metasomatism. An interesting fact about skarn is that its chemical or mineral composition does not define it; the formation process defines skarn. Some metamorphic rocks are known as metasomatic rocks. Metasomatism is the process of alteration of rocks by hot and chemically active fluids that diffuse and ... Read more

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Slate Rock Type, Composition, Formation, Occurrence & Uses

Tammy — Fri, 18 Nov 2022 11:56:59 +0000

Slate is a fine-grained, homogenous, and foliated metamorphic rock that forms due to regional metamorphism. Its parent rock is shale or mudstone, and the conversion process occurs due to low-grade regional metamorphism. The rock has a slaty cleavage, breaking easily along the foliation lines. “Slate” is derived from the German word “schleissen,” meaning to split. ... Read more

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