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  2. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    Cermax xenon arc lamp with synthetic sapphire output window Wristwatch with synthetic sapphire watch crystal. Synthetic sapphire—also referred to as sapphire glass—is commonly used for small windows, because it is both highly transparent to wavelengths of light between 150 nm and 5500 nm (the visible spectrum extends about 380 nm to 750 nm ...

  3. Transparent ceramics - Wikipedia

    en.wikipedia.org/wiki/Transparent_ceramics

    Synthetic sapphire – single-crystal aluminum oxide (sapphire – Al 2 O 3) is a transparent ceramic. Transparent ceramics have recently acquired a high degree of interest and notoriety. Basic applications include lasers and cutting tools, transparent armor windows, night vision devices (NVD), and nose cones for heat seeking missiles.

  4. Sapphirine - Wikipedia

    en.wikipedia.org/wiki/Sapphirine

    Sapphirine is a rare mineral, a silicate of magnesium and aluminium, with the chemical formula (Mg,Al) 8 (Al,Si) 6 O 20 (with iron as a major impurity). Named for its sapphire-like colour, sapphirine is primarily of interest to researchers and collectors: well-formed crystals are treasured and occasionally cut into gemstones.

  5. Corundum - Wikipedia

    en.wikipedia.org/wiki/Corundum

    Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]

  6. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem , jewel , precious stone , semiprecious stone , or simply gem ) is a piece of mineral crystal which, when cut or ...

  7. Is Apple Inc. Risking Too Much With Sapphire Crystal? - AOL

    www.aol.com/2014/03/05/is-apple-inc-risking-too...

    Corning , which supplies its Gorilla Glass for Apple's iPhones, is still trying to wrap its mind around why Apple will be using sapphire crystal in some of its future products. While the glass may ...

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