Agate (thunder egg) |
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AgateHydrogenous 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. |
| https://gotbooks.miracosta.edu/rocks/sedimentary/1.html | 2/2/2021 |