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See all on WikipediaThunderegg - 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 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
Wikipedia text under CC-BY-SA license What are thundereggs? The rare, chalcedony-filled …
Jul 4, 2024 · Thundereggs look like regular rocks from the outside, but contain intricate and colorful mineral patterns inside — often made of quartz, chalcedony, or agate. They are nodule-like rocks typically...
Thunder Egg - Geology Page
Oct 19, 2016 · A Thunder Egg “Thunderegg” 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 …
Thundereggs – Where to Find in Oregon & How to …
Mar 14, 2018 · Formed millions of years ago, Thunderegg (Thunder egg) is a round nodule-like rock formation, filled with agate, jasper, opal, and/or quartz crystals. Thunderegg is also called agate-filled or jasper-filled nodules. …
Thundereggs - Natural Atlas
On 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 …
Thundereggs Stone : Formation, Locations, Properties - Geology …
Jul 1, 2024 · Thundereggs are the result of specific geological processes that involve the deposition of minerals within cavities or gas bubbles in volcanic rocks. Here’s a simplified …
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What is a thunderegg? | U.S. Geological Survey - USGS.gov
Feb 3, 2009 · Today's question is ... Oregon's State rock, the "thunderegg," may be the best known gem material from Oregon. Thundereggs were not, as believed by some people, …
Thunder Egg or Thunderegg (Learn How to Identify …
Sep 25, 2023 · Thunder Eggs are Oregon’s state rock. These orange-sized mud balls become filled with beautiful layers of Agate over time. Once you cut them open you’ll notice a variety of colors ranging from blues to grays to whites and …
How to Tell if a Rock is a Thunderegg: Identification …
Nov 29, 2023 · Thundereggs are nodules or geodes that form within volcanic ash layers, characterized by an outer shell of hardened rock and captivating centers of crystallized minerals such as agate, jasper, or opal. This article is part of …
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 …
