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  2. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    An amethyst geode that formed when large crystals grew in open spaces inside the rock. The largest amethyst geode found as of 2007 was the Empress of Uruguay, found in Artigas, Uruguay in 2007. It stands at a height of 3.27 meters, lies open along its length, and weighs 2.5 tons. Amethyst is also found and mined in South Korea. [19]

  3. 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.

  4. Empress of Uruguay - Wikipedia

    en.wikipedia.org/wiki/Empress_of_Uruguay

    The geode was found in a mine near the city of Artigas, known for its spectacular geodes and amethysts. It was extracted from the surrounding basalt in a complicated process that took three months. The top part was cut to allow for a view of the interior and the amethyst crystals that were on the top were sold.

  5. Artigas Department - Wikipedia

    en.wikipedia.org/wiki/Artigas_Department

    Artigas department was created by law on 1 October 1884, ... The largest amethyst geode worldwide was discovered in Artigas in 2007, called the Empress of Uruguay. It ...

  6. 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. [83] [84]

  7. Allison and Roberto Mignone Halls of Gems and Minerals

    en.wikipedia.org/wiki/Allison_and_Roberto_Mignon...

    The thin, radiant, six pointed star, or asterism, is created by incoming light that reflects from needle-like crystals of the mineral rutile which are found within the sapphire. The Star of India is polished into the shape of a cabochon , or dome, to enhance the star's beauty. [ 12 ]

  8. Give The Gift Of Knowledge With These 23 Awesome Educational ...

    www.aol.com/lifestyle/gift-knowledge-23-awesome...

    #19 Uncover Hidden Beauty With National Geographic Break Open 10 Premium Geodes And Let Your Kids Experience The Thrill Of Breaking Open Geodes To Reveal Stunning Crystal Interiors. It's A Magical ...

  9. 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 ...

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