Contrary to what the visitors may have said anything bad about the Rockhound State Park, the thundereggs, opal, and jasper still can be found in that park and it takes some work. It used to be a favorite place for me to stop, camp out, and set up a "rockhounding operation base" because of a number of collecting sites nearby. There is a specific place in the Rockhound State Park where one may find any thundereggs (Click on to see the Picture), but you would have to walk quite a way up there, and do some digging (or working hard to chisel the eggs out of weathered but hard tan pertile/tuff beds). When you do get there, just look for any mine tailings where people had been digging, and search thru the tailings to find what diggers missed. As of Jan 2022, It must be cautioned that there is unmarked state land boundary up there and that's where it's best to leave alone.

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	That is what a thunderegg looks like when it's siti-in in the tan weathered pertile/tuff lava rock host. The only obvious sign of the thunderegg was the glassylike brown spot, a characteristic color of the thunderegg.
	Now it's just a matter of spending some time chiseling the pertile/tuff rock off the thunderegg. This picture is taken just before it was chiseled loose. Since the horizontally banded agate/opal are common in the thundereggs, I marked where the top is for purpose of keeping it upright while cutting it with the diamond-toothed saw.
	Voila! This is what the inside of a thunderegg looks like after it had been cut and polished. This particular thunderegg is a "Tillage" thunderegg which a waterline band is tilted at an angle in respect to the lower (and older) waterline bands. The feature demonstrated a tectonic activity (faulting) during its formation as well as the fact that the agate and opals were formed in sequence (seasonally), not at once. They're quite useful as a geological tool. That's why it is advised that any thunderggs be marked on their tops before they were removed from their host rocks for best results... The other pair ended up missing (lost? stolen?)... :( *sniff*
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YOU CAN CLICK ON THE PICTURES TO SEE LARGER PICTURES

Rough Appearance: Brown thundereggs caked with orange to yellowish tan weathered pertile/tuff.
Tend to be hollow with white opal layers at the bottom, agate are typically clear sometimes with some blue to black tints.
Can be confused with those coming from NeverAgain Mine which is just south of Rockhound Park.
But the rough from Rockhound Park is far more likely to be encountered.