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More From Geology.com:


rocks
Rock Gallery: Photos of igneous, sedimentary and metamorphic rocks.
gem photos
100+ Gems Photos of over 100 beautiful gems ranging from the popular to the obscure.
Don't Go To Jail
Know the Rules before removing rocks or minerals from public or private property.
Geodes
Geodes look like ordinary rocks on the outside but can be spectacular inside!
minerals
Minerals: Information about ore minerals, gem materials and rock-forming minerals.
Diamonds
Diamonds: Learn about the properties of diamond, its many uses and diamond discoveries.
Fluorescent Minerals
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.