File:Detail, Quartz-agate nodule (Killer Green Claim, Ochoco Mountains, Prineville, Oregon, USA) (33993292453) (cropped).jpg

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Quartz-agate nodule ("Thunder Egg") from Oregon, USA.

"Agate" is a rockhound/collector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2). Agate is quartz.

"Thunder eggs" are agate-filled masses that fill former cavities in rocks (see Colburn, 2004 for more info.).

Locality: Killer Green Claim, near Prineville, Ochoco Mountains, central Oregon, USA)

Reference cited:

Colburn (2004) - The Formation of Thundereggs (Lithophysae). 493 pp. (<a href="http://www.cvmineralclub.org/MAIN/Pages/Members Articles/Jack Marcy/The Formation of Thundereggs-Revised 2004.pdf" rel="nofollow">www.cvmineralclub.org/MAIN/Pages/Members%20Articles/Jack%...</a>) (This long document may take a little while to load on your computer.)
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Source Quartz-agate nodule (Killer Green Claim, Ochoco Mountains, Prineville, Oregon, USA)
Author James St. John
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