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  2. List of companies of Jamaica - Wikipedia

    en.wikipedia.org/wiki/List_of_companies_of_Jamaica

    J. Wray and Nephew Ltd. Consumer goods Distillers & vintners Kingston: 1825 Distiller P A Jamaica Air Shuttle: Consumer services Airlines Kingston: 2009 Airline, defunct 2013 P D Jamaica Observer: Consumer services Publishing Kingston: 1993 Newspaper P A Jamaica Pegasus Hotel: Consumer services Hotels Kingston: 1973 Hotel P A Jamaica Stock ...

  3. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    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. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...

  4. Engineered stone - Wikipedia

    en.wikipedia.org/wiki/Engineered_stone

    Engineered stone is a composite material made of crushed stone bound together by an adhesive to create a solid surface. The adhesive is most commonly polymer resin, with some newer versions using cement mix. This category includes engineered quartz (SiO 2), polymer concrete and engineered marble stone. [1]

  5. Jamaica Stock Exchange - Wikipedia

    en.wikipedia.org/wiki/Jamaica_Stock_Exchange

    The Jamaica Stock Exchange is the principal stock exchange of Jamaica, also known as JSE. Incorporated in 1968, JSE opened in 1969 in Kingston, Jamaica . Today, the JSE is one of the largest stock exchanges in the Caribbean by size and market capitalization.

  6. Alpart - Wikipedia

    en.wikipedia.org/wiki/Alpart

    Alumina Partners of Jamaica, also known as Alpart, is a company that owns and operates a bauxite refinery in Nain, Jamaica. [1] Alpart was founded in 1969 as a joint venture by Kaiser Aluminum, Reynolds Aluminum, and Anaconda. [2] Alpart exports 1.65 million tonnes of alumina overseas per year, and earned gross revenues of US$1.3 billion in ...

  7. Quartz inversion - Wikipedia

    en.wikipedia.org/wiki/Quartz_inversion

    The room-temperature form of quartz, α-quartz, undergoes a reversible change in crystal structure at 573 °C to form β-quartz.This phenomenon is called an inversion, and for the α to β quartz inversion is accompanied by a linear expansion of 0.45%.

  8. Nihon Dempa Kogyo - Wikipedia

    en.wikipedia.org/wiki/Nihon_Dempa_Kogyo

    Nihon Dempa Kogyo Co., Ltd. or NDK (日本電波工業株式会社, Nihon Dempa Kogyo Kabushiki-gaisha) is one of the world's largest quartz crystal companies, based in Shibuya, Tokyo, Japan. Using its synthetic quartz crystals , NDK produces crystal-related products such as crystal devices (e.g. crystal units, crystal oscillators , crystal ...

  9. Gypsum - Wikipedia

    en.wikipedia.org/wiki/Gypsum

    Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk.