Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type. Additionally, different classification systems exist for each รขโ‚ฌยฆ This chapter presents a system for the identification and classification of rocks and includes standard terminology and descriptive criteria for physical properties of engineering significance.

Rocks on earth are classified according to the way they were formed. Igneous rocks come from magma or lava. Sedimentary rocks are made from sediments. Metamorphic rocks are the result of great heat รขโ‚ฌยฆ Classification the classification of rocks is based on two criteria, texture and composition. The texture has to do with the sizes and shapes of mineral grains and other constituents in a rock, รขโ‚ฌยฆ A simplified classification diagram for igneous rocks based on their mineral compositions.

Classification the classification of rocks is based on two criteria, texture and composition. The texture has to do with the sizes and shapes of mineral grains and other constituents in a rock, รขโ‚ฌยฆ A simplified classification diagram for igneous rocks based on their mineral compositions. Note that glassy igneous rocks pumice and obsidian are not included on this diagram. A clear, scientifically grounded overview of what rocks are, how the three major rock types form, and why rock classification matters in geology and engineering.

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