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  2. Geode - Wikipedia

    en.wikipedia.org/wiki/Geode

    Very large amethyst and regular quartz geodes 'Crystal cave' is both an informal term for any large crystal-lined geode and also used for specific geoheritage locations such as the Crystal Cave (Ohio), discovered in 1887 at the Heineman Winery on Put-In-Bay, Ohio, the Cave of the Crystals (Mexico), and the Pulpi Geode, discovered in 1999 in Spain.

  3. Empress of Uruguay - Wikipedia

    en.wikipedia.org/wiki/Empress_of_Uruguay

    The Empress of Uruguay is the world's largest amethyst geode, standing at a height of 3.27 meters. It is open along its length and weighs 2.5 tons in its current state. It was discovered in 2007 in the Artigas department, Uruguay by the Uruguayan mining company Le Stage Minerals. Its estimated value is US $190,000, although it is not for sale. [1]

  4. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    [6]: 13 The center is often macrocrystalline quartz (quartz with visible crystals), [7] which can also occur in bands and forms when there is not enough water in the silica gel to promote chalcedony polymerization. [6]: 18 When the silica concentration of the gel is too low, a hollow center forms, called an agate geode.

  5. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    Artigas, Uruguay and neighboring Brazilian state Rio Grande do Sul are large world producers, with lesser quantities mined in Minas Gerais and Bahia states. [14] 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 ...

  6. Dogtooth spar - Wikipedia

    en.wikipedia.org/wiki/Dogtooth_spar

    Dogtooth spar crystals are found in caves, open spaces including veins and fractures, and geodes. They are so named for their resemblance to dog's teeth. [1] The crystals are generally centimeters long, but anomalous samples decimeters long exist, notably in Sitting Bull Crystal Caverns. A layer of crystalline calcite can be found underneath ...

  7. Bristol Diamonds - Wikipedia

    en.wikipedia.org/wiki/Bristol_Diamonds

    The geodes containing the Bristol Diamonds are frequently found in this conglomerate, in the areas of Bridge Valley Road, Leigh Woods, Sea Mills and St Vincent's Rocks. [ 6 ] [ 7 ] [ 8 ] The geodes were formed from quartz, either megaquartz or fibrous quartz, the diamonds themselves resulting from the dissolution of nodules of anhydrite leaving ...

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