Rocks

Sedimentary Rocks

Limestone Rock Type, Composition, Formation, & Uses

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Tammy

Limestone is a non-clastic sedimentary rock consisting of more than 50% calcite (a calcium carbonate mineral, CaCO3). Limestone is mostly ...

Basalt Rock
Igneous Rocks

Basalt Rock Type, Formation, Occurrence & Uses

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Tammy

Basalt belongs to volcanic igneous rocks family. It is a dark-colored (black, dark green or brown) rock with a fine-grained ...

Dacite Rock
Igneous Rocks

Dacite Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

Dacite is a volcanic igneous rock. It is a fine-grained rock that is normally light in color and is often ...

Diorite Rock
Igneous Rocks

Diorite Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

Diorite is a coarse-grained intrusive igneous rock. Its composition is in-between granite and basalt. The rock is usually found as ...

Gabbro Rock
Igneous Rocks

Gabbro Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

Gabbro is an intrusive igneous rock with a black or dark-green appearance. The term “Gabbro” was first used in the ...

Obsidian Rock
Igneous Rocks

Obsidian Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

Obsidian is an igneous rock. It is an amorphous material, commonly known as a mineraloid. The rock is formed when ...

Pegmatite Rock
Igneous Rocks

Pegmatite Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

Pegmatite is a coarse-grained igneous rock that contains large crystals and minerals typically not found in other types of rocks. ...

Peridotite Rock
Igneous Rocks

Peridotite Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

Peridotite is a group of dense and coarse-grained ultramafic igneous rocks. The rock group contains kimberlite. The group can also ...

Pumice Rock
Igneous Rocks

Pumice Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

Pumice is an igneous rock that has a light-colored and extremely porous appearance. It has been used in various industries ...

Rhyolite Rock
Igneous Rocks

Rhyolite Rock Type, Composition, Formation, Occurrence & Uses

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Tammy

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