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Rhyolite Rock
Igneous Rocks

Rhyolite Rock Type, Composition, Formation, Occurrence & Uses

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Rhyolite is an extrusive igneous rock with a high silica concentration. The rock is usually pink or gray. The grains ...

Scoria Rock
Igneous Rocks

Scoria Rock Type, Composition, Formation, Occurrence & Uses

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Scoria is a porous and dark-colored igneous rock that may or may not contain crystals. The usual color of scoria ...

Trap rock
Igneous Rocks

Trap Rock, Types, Occurrence & Uses

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Trap rock is not a rock, but it is a broad term used to define dark-colored igneous rocks used to ...

Tuff Rock
Igneous Rocks

Tuff Rock Type, Composition, Formation, Occurrence & Uses

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Tuff is an ingenious rock made from ash and sediments eruptions in volcanic explosions. The explosive volcano eruptions eject rocks, ...

Obsidian Rock
Metamorphic Rocks

Amphibolite Rock Type, Formation, Occurrence & Uses

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Amphibolite is a dark-colored, weekly-foliated metamorphic rock that contains plagioclase feldspar and amphibole of the hornblende group. The amphibole is ...

Gneiss Rock
Metamorphic Rocks

Gneiss Rock Type, Composition, Formation, Occurrence & Uses

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Gneiss is a common and widely distributed foliated metamorphic rock. It is identified by its bands and lenses of varying ...

Hornfels Rock
Metamorphic Rocks

Hornfels Rock Type, Composition, Formation, Occurrence & Uses

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Hornfels is a non-foliated and very fine-grained metamorphic rock with a variable composition. It is a very hard rock with ...

Lapis Lazuli Rock
Metamorphic Rocks

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

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Tammy

Lapis Lazuli, or lapis, is one of the oldest spiritual stones known to mankind. It has been used by healers, ...

Marble Rock
Metamorphic Rocks

Marble Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

Marble is a non-foliated metamorphic rock frequently used worldwide in various applications. Very few rocks have so many uses as ...

Mariposite Rock
Metamorphic Rocks

Mariposite Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

The word Mariposite is often used to identify green micas colored by small amounts of chromium. Mariposite is also used ...