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  2. 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.

  3. Thunderegg - Wikipedia

    en.wikipedia.org/wiki/Thunderegg

    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 different ways for a hollow to form.

  4. 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]

  5. What fall looks like in every state - AOL

    www.aol.com/fall-looks-every-state-170208747.html

    According to the city's website, a favorite local pastime in Keokuk, Iowa, is searching for geodes, or magnificent crystallized rocks, in the Keokuk Creek.

  6. Gone winter rockhounding in Washington state? You can find ...

    www.aol.com/gone-winter-rockhounding-washington...

    Washington state is a hotbed for minerals, gemstones, crystals and fossils, making the Evergreen state a popular site for rockhounding. Whether in an official group or going solo, rockhounding is ...

  7. File:Agate- & quartz-lined geode 5 (32375570960).jpg - Wikipedia

    en.wikipedia.org/wiki/File:Agate-_&_quartz-lined...

    This is a cut slice from the interior of a geode. Geodes are small to large, subspherical to irregularly-shaped, crystal-lined cavities in rocks. They form when water enters a void in a host rock and precipitates crystals. The most common geode-lining mineral is quartz. This geode is bordered by brownish, yellowish, and grayish agate.

  8. Enhydro agate - Wikipedia

    en.wikipedia.org/wiki/Enhydro_agate

    Enhydro agates are nodules, agates, or geodes with water trapped inside its cavity. [1] Enhydros are closely related to fluid inclusions, but are composed of chalcedony. The formation of enhydros is still an ongoing process, with specimens dated back to the Eocene Epoch. [2] They are commonly found in areas with volcanic rock. [3]

  9. Celestine (mineral) - Wikipedia

    en.wikipedia.org/wiki/Celestine_(mineral)

    The world's largest known geode, a celestine geode 35 feet (11 m) in diameter at its widest point, is located near the village of Put-in-Bay, Ohio, on South Bass Island in Lake Erie. The geode has been converted into a viewing cave, Crystal Cave, with the crystals which once composed the floor of the geode removed. The geode has celestine ...

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