The Agate Page – University of Nebraska - Lincoln http://csd.unl.edu/agates/agatepageintro.asp
Rock hounding for Kids
http://www.fi.edu/fellows/fellow1/oct98/index2.html
RockExpo.com ~ Coming soon
Ellensburg Blue Agate Blog
Information on Drusy Agate
Information on Botryodal agates and gemstones
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Information on Lake Superior Agates
Another rare blue gemstone - Larimar
