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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. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz crystal demonstrating transparency. Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. [33]

  4. Bristol Diamonds - Wikipedia

    en.wikipedia.org/wiki/Bristol_Diamonds

    Bristol Diamonds are quartz crystals found in geodes and geological rock formations which occur in dolomitic conglomerate in the Avon Gorge in Bristol, England.Their origin lies in geological processes of the Triassic period, about 250 to 200 million years ago.

  5. Druse (geology) - Wikipedia

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

    Druse quartz crystals Druse of uvarovite from the Urals; size: 18.3 cm × 13.1 cm × 2.0 cm ... or vein or within a vug or geode. [2] See also

  6. Cave of the Crystals - Wikipedia

    en.wikipedia.org/wiki/Cave_of_the_Crystals

    Cave of the Crystals or Giant Crystal Cave (Spanish: Cueva de los cristales) is a cave connected to the Naica Mine at a depth of 300 metres (980 ft), in Naica, Chihuahua, Mexico. It takes the form of a chamber within the limestone host rock of the mine, and is about 109 metres (358 ft) long with a volume of 5,000 to 6,000 cubic metres (180,000 ...

  7. Herkimer diamond - Wikipedia

    en.wikipedia.org/wiki/Herkimer_diamond

    Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [ 1 ] [ 2 ] They are not diamonds ; the "diamond" in their name is due to both their clarity and well formed faces.

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