Rocks

BY: Thomas Fasano

What are rocks?

Rocks are composed of minerals. They are classified by how they were formed (their origin).

Gabbro

Gabbro is an intrusive Igneous rock. It is formed inside a volcano. It's texture is course and is non-vesicular. The minerals it is composed of are Plagioclase Feldspar, Biotite, Amphibole, Pryoxene, and Olivine. Gabbro is a darker color and has a high density.
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Limestone

Limestone is a chemically and/or organically formed Sedimentary rock. It's texture is crystalline or bioclastic and has a grain size of microscopic to very coarse. Limestone is composed of Calcite.
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Marble

Marble is a Metamorphic rock. It's texture is Non-Foliated and has a grain size of fine to coarse. Marble is composed of Calcite and/or Dolomite. Marbles type of Metamorphism is regional or contact.
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