San Diego Natural History Museum
San Diego Natural History Museum: Mineral Matters: Mine Games
Learn about minerals and have fun, too, playing Sedimentary, My Dear Watson, Knowledge Nuggets, Mining for Minerals (Interactive), and Minerals Matter. Downloadable features.
Quia
Quia: Dig Into Geology
Site provides games and activities that will allow students to have fun, and learn more about rocks and minerals at the same time.