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Rocks: Igneous, Metamorphic and Sedimentary - Geology.com
Igneous Rocks | Pictures of Intrusive and Extrusive Rock Types
Sedimentary Rocks | Pictures, Characteristics, Textures, Types
Mineral Properties, Photos, Uses and Descriptions - Geology.com
Gemstones: Facts, photos, and information for over 100 gems.
Metamorphic Rocks | Pictures of Foliated and Non-Foliated Types
The "Acid Test" for Carbonate Minerals and Carbonate Rocks
Quartzite: Metamorphic Rock - Pictures, Definition & More
Meteorite Identification: Have you found a space rock?
Granite: Igneous Rock - Pictures, Definition & More - Geology.com