Agate (thunder egg)

Agate thunder egg


Hydrogenous sedimentary rock.
Agate is any banded layers of silica deposited by water filling in holes is siliceous sedimentary or volcanic rocks. This is an example of a "thunder egg" where agate accumulated with a whole left behind by a plant root in a volcanic ash deposit.
This sample is from the thunder egg source area in Ochoco National Forest near Madras, eastern Oregon. 2/2/2021