Teaching and learning resources are available through On the Cutting Edge, a Geoscience teaching resource site. You can also find a free college-level course on the topic through MIT's Open Course-ware Platform.
To see some great pictures of rocks and minerals, you can view the galleries of rocks, minerals, and gems on display at the Smithsonian Museum. (Gems are cut and polished rocks or minerals which have monetary value and are used in jewelery) or several other online galleries.
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