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This site is site is very useful for understanding how to classify and identify rocks and minerals, and even tell the difference between the two. It provides the viewer with other resources including good field guides and books for young learners. One truly valuable use for the site comes from the tables it supplies. It has different tables for each of the mineral properties, listing for example, the various ways to group colors. It also gives you good ideas on how to describe these colors including a list of words that help describe the intensity of color and the distribution of the color. This is especially helpful for new learners. At the bottom of the main page it also has a glossary of words and a link for a geological dictionary to provide extra support. All of these features provided by the site can be a great resource for students or teachers.