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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is a hard, crystalline mineral ... are expensive and rare. These high-purity quartz are defined as containing less than 50 ppm of impurity elements. [78] ...

  3. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    In more expensive high-end quartz watches, thermal compensation can be implemented by varying the number of cycles to inhibit depending on the output from a temperature sensor. The COSC average daily rate standard for officially certified COSC quartz chronometers is ±25.55 seconds per year at 23 °C or 73 °F.

  4. What's the Difference Between Quartz and Quartzite? - AOL

    www.aol.com/whats-difference-between-quartz...

    Learn about quartz vs. quartzite countertops pros and cons from experts, including differences in cost, care, and design possibilities.

  5. Concord Watch - Wikipedia

    en.wikipedia.org/wiki/Concord_watch

    Dubbed the world's thinnest watch, it ranged from $4,900 to over $20,000 for customized models with diamonds. Concord Watch Company is a Swiss luxury goods company that is part of the Movado group, which produces and distributes Movado, Ebel, Coach, and Hugo Boss -branded watches. Founded in 1908, Concord was purchased in 1970 by the North ...

  6. Smoky quartz - Wikipedia

    en.wikipedia.org/wiki/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 the ...

  7. Watch - Wikipedia

    en.wikipedia.org/wiki/Watch

    [1] [2] In the 1960s the electronic quartz watch was invented, which was powered by a battery and kept time with a vibrating quartz crystal. By the 1980s the quartz watch had taken over most of the market from the mechanical watch. Historically, this is called the quartz revolution (also known as the quartz crisis in Switzerland).

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