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What are some good sources for identifying rocks?

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Quick Answer

Some good sources for identifying rocks are geology.com, About.com and National Geographic. A good source teaches the reader the differences between categories of igneous rocks, sedimentary rocks and metamorphic rocks.

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Full Answer

The sources also teach the reader how to identify rocks through such characteristics as grain size, foliation, color, hardness and taste. A good source then focuses on individual rocks in one of the three categories. For example, an igneous rock of any color that is very coarse, with small, intrusive bodies and a granitic composition is most likely pegmatite. A metamorphic rock that is foliated, with a fine grain, light color and a soft greasy feel is most likely soapstone.

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