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  2. Engineered stone - Wikipedia

    en.wikipedia.org/wiki/Engineered_stone

    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]

  3. Granite - Wikipedia

    en.wikipedia.org/wiki/Granite

    True granite (according to modern petrologic convention) contains between 20% and 60% quartz by volume, with 35% to 90% of the total feldspar consisting of alkali feldspar. Granitic rocks poorer in quartz are classified as syenites or monzonites, while granitic rocks dominated by plagioclase are classified as granodiorites or tonalites.

  4. 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 ...

  5. Amethyst - Wikipedia

    en.wikipedia.org/wiki/Amethyst

    Amethyst is a purple variety of quartz (SiO. 2) and owes its violet color to irradiation, impurities of iron (Fe3+. ) and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. [2][3][4] The irradiation causes the iron Fe3+.

  6. QFL diagram - Wikipedia

    en.wikipedia.org/wiki/Qfl_diagram

    QFL diagram. Ternary diagram showing the relative abundance of quartz, feldspar, and lithic grains and views of what selected compositions would look like. A QFL diagram or QFL triangle is a type of ternary diagram that shows compositional data from sandstones and modern sands, point counted using the Gazzi-Dickinson method.

  7. Costco - Wikipedia

    en.wikipedia.org/wiki/Costco

    Costco membership card from Iceland. Costco's earliest predecessor, Price Club, opened its first store on July 12, 1976, on Morena Boulevard in San Diego, California.It was founded three months earlier by Sol Price and his son, Robert, following a dispute with the new owners of FedMart, Price's previous membership-only discount store. [15]

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