Description
Thunderegg
Size is about 2.25 inches in diameter and weighing at 102 grams.
A Thunderegg is a round rock that forms in volcanic areas. On the outside it looks plain and rough, but when it is cut open it can show colorful patterns of agate or crystals inside. Thundereggs formed millions of years ago when minerals slowly filled spaces in volcanic rock. Each one has different colors and patterns. They are often collected and used to help people learn about rocks and minerals.
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