Rocking Out

Treasa Moscato

WHAT IS A ROCK?

A rock is the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil or oceans.

There are three different types of rocks: igneous, sedimentary, and metamorphic.

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PEGMATITE

Pegmatite is an igneous rock that forms during the final stage of magma's crystallization. They contain exceptionally large crystals, so it was formed slowly. It has a very coarse texture. It is non-vesicular. It usually has a light color, low density, and it is rich in Si and Al, and composed of potassium feldspar (20%), quartz (30%), plagioclase feldspar (20%), biotite (10%), and amphibole (10%).
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SHALE

Shale is an inorganic, land-derived sedimentary sock. It has a clastic texture and has a grain size of less than 0.0004 cm. It is composed of mostly quartz, feldspar, and clay minerals. It may contain fragments of other rocks and minerals. Shale is compact and may split very easily.
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GNEISS

Gneiss is a metamorphic rock that has a banding texture and a grain size from medium to coarse. It is composed of mica, quartz, feldspar, amphibole, garnet, and pyroxene. It has a regional type of metamorphism. It has high-grade metamorphism; mineral types are segregated into bands.