Oregon's Thundereggs
12/05/25 08:41 Filed in: Oregon
The Hunt for Thundereggs in Oregon
We have thundereggs in our home and they are super cool. There are a number of rock stores in the area and people go rock hunting in the state. Last rock place though we visited was Custer, SD.
From an article here about Thundereggs.
<<Sixty years ago, in 1965, the fascinating thunderegg was declared Oregon’s state rock.
People come to Oregon from all over the world to hunt for thundereggs, the seemingly unremarkable egg-shaped rocks that hide beautiful patterns of agate, opal, jasper and other gemstones.
Oregon’s thundereggs formed up to 60 million years ago, when gas bubbles were encased in molten lava. The water and minerals that filled in those holes form surprisingly beautiful shapes and colors.>>
We have thundereggs in our home and they are super cool. There are a number of rock stores in the area and people go rock hunting in the state. Last rock place though we visited was Custer, SD.
From an article here about Thundereggs.
<<Sixty years ago, in 1965, the fascinating thunderegg was declared Oregon’s state rock.
People come to Oregon from all over the world to hunt for thundereggs, the seemingly unremarkable egg-shaped rocks that hide beautiful patterns of agate, opal, jasper and other gemstones.
Oregon’s thundereggs formed up to 60 million years ago, when gas bubbles were encased in molten lava. The water and minerals that filled in those holes form surprisingly beautiful shapes and colors.>>
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