Thunderegg Half 4
June 2008
A thunderegg is a rock nodule formed in volcanic ash, often filled with agate. This one is from Mexico, cut in half to show the inside.
A Thunderegg half from Mexico.
A thunderegg is a rock nodule formed in volcanic ash, often filled with agate. This one is from Mexico, cut in half to show the inside.
A Thunderegg half from Mexico.