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- PrinevillePrineville, OR 97754
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This site offers thundereggs that are filled with colorful jasper. Shades of red, yellow, and tan are available as well as a creamy white color. The thundereggs can be difficult to remove from the hard rhyolite matrix, so bring hand tools adequate for breaking rock. Look for chips and pieces of jasper where other rockhounds have been digging for potential leads.
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