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  2. Thunderegg - Wikipedia

    en.wikipedia.org/wiki/Thunderegg

    Thunderegg is not synonymous with either geode or agate. A geode is a simple term for a rock with a hollow in it, often with crystal formation/growth. A thunderegg on the other hand is a specific geological structure. A thunderegg may be referred to as a geode if it has a hollow in it, but not all geodes are thundereggs because there are many ...

  3. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    The thunderegg, a nodule-like geological structure, similar to a geode, that is formed within a rhyolitic lava flow, were said by the Native Americans of Warm Springs to have been created by thunder spirits that lived in the craters of Mount Hood and Mount Jefferson.

  4. Lithophysa - Wikipedia

    en.wikipedia.org/wiki/Lithophysa

    If the cavity becomes lined with crystals it may be referred to as a geode or if filled partially or fully with agate, jasper or opal it is called a thunderegg. The term vug is also used for similar cavities although the meaning of vug is usually restricted to cavities in rocks formed by the removal of material such as soluble minerals.

  5. Geode - Wikipedia

    en.wikipedia.org/wiki/Geode

    A geode (/ ˈ dʒ iː. oʊ d /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.

  6. Rockhound State Park - Wikipedia

    en.wikipedia.org/wiki/Rockhound_State_Park

    Rockhound State Park is a state park of New Mexico, United States, located 7 miles (11 km) southeast of Deming. [1] It is named for the abundance of minerals in the area, and visitors can search for quartz crystals, geodes, jasper, perlite, and many other minerals.

  7. 80-million-year-old dinosaur eggs dug up in China are the ...

    www.aol.com/80-million-old-dinosaur-eggs...

    Six small non-avian dinosaur eggs, no bigger than grapes, were discovered during a field study in Ganzhou, China, in 2021. These eggs now mark the smallest-ever found in the world.

  8. Mineral collecting - Wikipedia

    en.wikipedia.org/wiki/Mineral_collecting

    A collection of identified rocks and minerals on display. The black stones on the left are obsidians; the lighter, hollow rocks are geodes. A collection of smaller mineral samples stored and displayed in clear cases Azurite specimen from the Morenci mine, Morenci, Arizona, USA.

  9. Vug - Wikipedia

    en.wikipedia.org/wiki/Vug

    Geodes are a vug-formed rock, although that term is usually reserved for more rounded crystal-lined cavities in sedimentary rocks and ancient lavas. [2] The word vug was introduced to the English language by Cornish miners, from the days when Cornwall was a major supplier of tin. [3] The Cornish word was vooga, which meant "cave". [3]

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