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  2. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    An early use of the piezoelectricity of quartz crystals was in phonograph pickups. One of the most common piezoelectric uses of quartz today is as a crystal oscillator. The quartz oscillator or resonator was first developed by Walter Guyton Cady in 1921. [86] [87] George Washington Pierce designed and patented quartz crystal oscillators in 1923.

  3. Portal:Minerals - Wikipedia

    en.wikipedia.org/wiki/Portal:Minerals

    Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α ...

  4. Charnockite - Wikipedia

    en.wikipedia.org/wiki/Charnockite

    Late-stage charnockite dykes cutting anorthosite, Rogaland, Norway Job Charnock's Mausoleum at St John's Church compound, Kolkata. Charnockite (/ ˈ tʃ ɑːr n ə k aɪ t /) is any orthopyroxene-bearing quartz-feldspar rock formed at high temperature and pressure, commonly found in granulite facies’ metamorphic regions, sensu stricto as an endmember of the charnockite series.

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

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

    So while natural materials make up about 90 percent of quartz countertops, the other 10 percent is artificial. What Is Quartzite? Quartzite, on the other hand, is a 100 percent natural material.

  6. Fused quartz - Wikipedia

    en.wikipedia.org/wiki/Fused_quartz

    [15] [16] For the same reason fused quartz is also the material used for modern glass instruments such as the glass harp and the verrophone, and is also used for new builds of the historical glass harmonica, giving these instruments a greater dynamic range and a clearer sound than with the historically used lead crystal. Quartz glassware is ...

  7. Quartz Vs. Granite: Which Stone Is Right For Your ... - AOL

    www.aol.com/quartz-vs-granite-stone-countertops...

    Quartz countertops are composed of crushed quartz crystals, resins, and more pigments. An increasingly popular choice for kitchens, quartz countertops are designed to be durable and resistant to ...

  8. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety.

  9. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    There are over 300 types of minerals that have been used as gemstones. Such as: A–B ... Metal-coated crystals hyped as rainbow quartz; Lab spinel; Synthetic ...

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