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-Typical colors: Red, purple, yellow.
-Typical sizes: 5
to 12 centimeters, rarely larger
-Typical shapes: Thunderegg-like
(bubbly & ridged)
-Most distinguishing characteristic:
Rusty thundereggs with a bit of red agate showing.
-Special Notes:
Thundereggs completely filled with agate are uncommon, and they tend to
be fractured.