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Colorado Prospector - Gem and mineral prospecting and mining forums _ Gem and Mineral Specimen Finds or Processes _ Thunderegg!

Posted by: JJCA Jul 4 2020, 11:59 AM

We borrowed a rock saw and found out that the rock we had was indeed a thunderegg! Does anyone have thoughts on what the yellow may be? Also, what’s the best way to polish something like this? Thanks so much!