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    Thunderegg - Wikipedia

    A thunderegg (or thunder egg) is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. Thundereggs are rough spheres, most about the size of a baseball—though they can range from a little more than a centimeter (one half inch) to over a meter (three feet) across. They … See more

    Thundereggs are found globally where conditions are optimal. In the US, Oregon is one of the most famous thunderegg locations. Germany is also an important center for … See more

    Thundereggs are found in flows of rhyolite lava. They form in the lava from the action of water percolating through the porous rock carrying See more

    Native American legend reportedly considers the rocks to be the eggs of the thunderbirds which occupied Mount Hood and See more

    On March 30, 1965, the thunderegg was designated as the Oregon state rock by a joint resolution of the Oregon Legislative Assembly. While thundereggs can be collected all over … See more

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  2. Thundereggs – Where to Find in Oregon & How to …

    Mar 14, 2018 · Oregon produces a great variety of thunder eggs that are known for their various colors and styles. Central and Eastern Oregon is the most popular region in the world for thundereggs hunting.

  3. Thunderbird Park: Thunderegg Fossicking | Tamborine Mountain, …

  4. What Are Thundereggs Worth? Unveiling the Hidden …

    Oct 4, 2024 · Thundereggs, those mysterious geological formations found in rock bed formations, have captured the fascination of collectors and enthusiasts for many years. But what exactly are these peculiar objects worth? Let’s explore …

  5. Thundereggs Stone : Formation, Locations, Properties - Geology …

  6. The Intricate Beauty of Thundereggs: A Collector’s Guide

    Aug 19, 2022 · Thundereggs are a prized geologic formation due to their beautiful cores contained within a rough outer layer. Similar to a geode, a thunderegg is a hollow rock which has been filled with mineral deposits. However, think of a …

  7. Thunder Egg or Thunderegg (Learn How to Identify …

    Sep 25, 2023 · How To Identify A Thunder Egg. Thunder Eggs are stunning and fascinating formations found in various parts of the world. They’re formed from volcanic ashes and different other sorts of debris. These eggs can contain …

  8. Thunder eggs may not be precious stones, but they are …

    Jan 21, 2022 · Holiday treasure hunts don't get more exciting than unearthing 120-million-year-old thunder eggs — and thanks to the pandemic, fossicking at one of the country's biggest deposits has never been ...

  9. How to Tell if a Rock is a Thunderegg: Identification …

    Nov 29, 2023 · Here are the key visual cues to help you identify a Thunderegg from the Shape, Size, Texture, Weight - How To Guide.

  10. Thunderegg Fossicking FAQs - Thunderbird Park