- Agates - University of Nebraska-Lincoln - Agate database, glossary, bibliography & more. Originally compiled by Roger Pabian
- Agate Formation - Penn State Research
- Agate Lady - Agate basics & Lake Superior Agates. Operates the Gitche Gumee Agate Museum in Grand Marais, Michigan.
- Agates of the Oregon Coast
- Agates with Inclusions - Gallery of agates (worldwide).
- Lake Superior Agate
- Tennessee Paint Rock Agates
- Johan Zenz - World-wide agate specimens
- Agate of the World
- Agate Beach - Website of one of my friends in Washington who has amazing tumble polished agates. Mike focuses on Montana Moss Agates and Lake Superior Agates.
- Compass Mentus - Website of one of my rockhounding pals in Washington. Charley focuses on Tahoma Agate from Western Washington. He also makes amazing maps.
- The Gem Shop - Website for longtime Wisconsin rockshop. Mines and sells agates.
- Amazing Agates - Website for South Dakota rockshop that focuses on agates.
- Beautiful Agates - Author of The Beauty of Banded Agates.
- Super Agates