Curated OER
National Park Service: Agate Fossil Beds: Geologic Formations
This National Park Service site has information about these fossil beds in Nebraska and where the name Agate came from.
Jewelry Central
Jewelry Central: Onyx
This page gives brief, general information on onyx, including its history, physical characteristics, and metaphysical properties. Commercial web site.
Other
Icga: Onyx, Black Magic
This site gives information on onyx's history, mystical background, and physical appearance. Also includes further information and pictures of the gem itself.
