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  1. Formula (repeating unit)SiO₂

    Quartz - Wikipedia

    • Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2. Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally a… See more

    Etymology

    The word "quartz" is derived from the German word Quarz, which had the same form in the first half of the 14th century in Middle High German and in East Central German and which came from the Polish dialect ter… See more

    Early studies

    Roman naturalist Pliny the Elder believed quartz to be water ice, permanently frozen after great lengths of time. He supported this idea by saying that quartz is found near glaciers in the Alps, but not on volcanic mountains, … See more

    Crystal habit and structure

    Quartz belongs to the trigonal crystal system at room temperature, and to the hexagonal crystal system above 573 °C (846 K; 1,063 °F). The ideal crystal shape is a six-sided prism terminating with six-sided pyramid-like … See more

    Varieties (according to color)

    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, ros… See more

    Piezoelectricity

    Quartz crystals have piezoelectric properties; they develop an electric potential upon the application of mechanical stress. Quartz's piezoelectric properties were discovered by Jacques and Pierre Curie in 1880. … See more

    Occurrence

    Quartz is a defining constituent of granite and other felsic igneous rocks. It is very common in sedimentary rocks such as sandstone and shale. It is a common constituent of schist, gneiss, quartzite and other … See more

    Mining

    Quartz is extracted from open pit mines. Miners occasionally use explosives to expose deep pockets of quartz. More frequently, bulldozers and backhoes are used to remove soil and clay and expose quartz veins, whic… See more

     
  1. Quartz | Definition, Types, Uses, & Facts | Britannica

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  4. Quartz Mineral | Photos, Uses, Properties, Pictures - Geology.com

  5. Quartz | Properties, Varieties, Occurrence and Uses

    Jul 1, 2024 · Quartz is one of the most abundant minerals in the Earth’s crust and can be found in many different geological settings. One of the most common settings for quartz formation is in igneous rocks, such as granite, where it can …

  6. quartz
    noun
    1. a hard white or colorless mineral consisting of silicon dioxide, found widely in igneous, metamorphic, and sedimentary rocks. It is often colored by impurities (as in amethyst, citrine, and cairngorm).
    More about quartz
  7. Quartzite - Wikipedia

    Quartzite is a very hard rock composed predominantly of an interlocking mosaic of quartz crystals. The grainy, sandpaper-like surface is glassy in appearance. Minor amounts of former cementing materials, iron oxide, silica, carbonate …

  8. The 24 Different Types Of Quartz (With Photos) - Rock …

    Jan 19, 2024 · Quartz is one of the most common and varied minerals on Earth, found in many different forms. Agate, amethyst, and Faden quartz are just a few examples of the types of quartz that exist. Not only is quartz fascinating for its …

  9. Quartz - Simple English Wikipedia, the free encyclopedia

    Quartz is a common mineral in Earth's crust with many varieties and uses. Learn about its crystal structure, properties, types, and shocked quartz as evidence of a meteor impact.

  10. quartz - Wiktionary, the free dictionary

    Aug 15, 2024 · quartz (countable and uncountable, plural quartzes) (mineralogy) The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, Si O 2. It occurs in a variety of forms, both crystalline and …

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