There are 3 main types of rocks: Igneous, Sedimentary, and Metamorphic. These types of rocks are characterized by a variety of different rocks in each category.
There are also minerals that can be distinguished and sometimes confused with rocks. Some of these minerals include Feldspar, Quartz, and Mica (as pictured above).
For a list and pictures of the different types of rock click the link below:
http://www.wisegeek.org/what-are-the-different-types-of-rocks.htm
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