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  2. Smoky quartz - Wikipedia

    en.wikipedia.org/wiki/Smoky_quartz

    Smoky quartz. Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystals. [6] The color of smoky quartz is produced when natural radiation, emitted from the surrounding rock, activates color centers around aluminum impurities within ...

  3. List of Steven Universe characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Steven_Universe...

    characters. All appearances of Future: Steven Universe, Garnet, Amethyst, Pearl, Connie Maheswaran, Lapis Lazuli, Peridot, Lars Barriga, Bismuth, The Great Diamond Authority (consists Yellow, White, and Blue (left and right)), and other uncorrupted gems, among others. Steven Universe is an American animated television series created by Rebecca ...

  4. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral ...

  5. Sunglasses - Wikipedia

    en.wikipedia.org/wiki/Sunglasses

    The first sunglasses, made from flat panes of smoky quartz called Ai Tai, meaning "dark clouds," [8] which offered no corrective powers but did protect the eyes from glare, were used in China in the 12th century or possibly earlier.

  6. Gemstone irradiation - Wikipedia

    en.wikipedia.org/wiki/Gemstone_irradiation

    Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties. High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1] As a result, the gem­stone's color may be ...

  7. Gemstones of Pakistan - Wikipedia

    en.wikipedia.org/wiki/Gemstones_of_Pakistan

    Various types of quartz are found in the region. The image shows a specimen of aquamarine and emerald on quartz from Swat valley. [3] Dir: Corundum and quartz The image shows pink and purple crystals of corundum. [3] Mansehra: Corundum and smoky quartz: The image shows aquamarine on smokey quartz. [3] Kohistan: Peridot

  8. Spessartine - Wikipedia

    en.wikipedia.org/wiki/Spessartine

    Spessartine's name is a derivative of Spessart in Bavaria, Germany, the type locality of the mineral. [3][4] It occurs most often in granite pegmatite [3][4][5] and allied rock types and in certain low-grade metamorphic phyllites. Sources include Australia, Myanmar, India, Afghanistan, Israel, Madagascar, Namibia, Nigeria, Mozambique, Tanzania ...

  9. Mineralogy of the Pikes Peak Region - Wikipedia

    en.wikipedia.org/wiki/Mineralogy_of_the_Pikes...

    The major collecting areas are on the west side of the mountain and they contain the usual assortment of smoky quartz and amazonite, although, like the Tarryalls, the amazonite is usually very pale and is most often grades into plain microcline. Devils Head is most noted for large topaz crystals and even larger smoky quartz crystals.

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