Different Types Of Rocks

By The News Voice

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A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. There are many different types of rocks that are found on earth classifies under three categories igneous rock, metamorphic rock, and sedimentary rock. Lets look at some common types of rocks you have seen.

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Basalt is a mafic extrusive igneous rock formed from the rapid cooling of lava rich in magnesium and iron. More than 90% of all volcanic rock on Earth is basalt.

Basalt

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Granite is a coarse-grained igneous rock, It forms from magma with a high content of silica and alkali metal oxides that slowly solidifies underground. Granite is nearly always massive, hard, and tough

Granite

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Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is hard, brittle, and amorphous; it therefore fractures with sharp edges. In the past, it was used to manufacture cutting and piercing tools.

Obsidian

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Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash.  It has been for roofing, floor tiles, and other purposes.

Slate

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Sandstone is a clastic sedimentary rock composed mainly of sand-sized silicate grains. sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black.

Sandstone

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Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite. Marble is commonly used for sculpture and as a building material.

Marble

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Serpentine rocks greenish, brownish, or spotted minerals. They are used as a source of magnesium and asbestos, and as a decorative stone. The name is thought to come from the greenish color being that of a serpent

Serpentine

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These are some of the beautiful but useful rocks found on Earth, truly natures wonder. How many rocks did you know about?

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