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

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

    You can find agates, fossils, gemstones. ... Jasper geode, from Green Mountain near Kalama. You are expected to know the regulations for rockhounding in a specific area before arriving. It will be ...

  4. 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 ...

  5. Geoid - Wikipedia

    en.wikipedia.org/wiki/Geoid

    The geoid (/ ˈ dʒ iː. ɔɪ d / JEE-oyd) is the shape that the ocean surface would take under the influence of the gravity of Earth, including gravitational attraction and Earth's rotation, if other influences such as winds and tides were absent.

  6. Geography of Iowa - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Iowa

    Geodes are found in southeast Iowa and are the official state rock. They consist of grey to pink cobbles within limestone that when cut or smashed open reveal a hollow crystal-filled interior. Geodes are common around Geode State Park in Henry County .

  7. 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]

  8. Vein (geology) - Wikipedia

    en.wikipedia.org/wiki/Vein_(geology)

    Vugs, cavities and geodes are all examples of open-space filling phenomena in hydrothermal systems. Alternatively, hydraulic fracturing may create a breccia which is filled with vein material. Such breccia vein systems may be quite extensive, and can form the shape of tabular dipping sheets, diatremes or laterally extensive mantos controlled by ...

  9. Physical geodesy - Wikipedia

    en.wikipedia.org/wiki/Physical_geodesy

    Gravity is commonly measured in units of m·s −2 (metres per second squared). This also can be expressed (multiplying by the gravitational constant G in order to change units) as newtons per kilogram of attracted mass.

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