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  2. 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 ...

  3. Hexagonal crystal family - Wikipedia

    en.wikipedia.org/wiki/Hexagonal_crystal_family

    In particular, there are crystals that have trigonal symmetry but belong to the hexagonal lattice (such as α-quartz). The hexagonal crystal family consists of the 12 point groups such that at least one of their space groups has the hexagonal lattice as underlying lattice, and is the union of the hexagonal crystal system and the trigonal ...

  4. Engineered stone - Wikipedia

    en.wikipedia.org/wiki/Engineered_stone

    Gulfstone, an Oman-based company, is the only producer of engineered quartz stone in the GCC. China is now probably the largest market for engineered marble due to new construction projects, while engineered quartz is primarily sold in North America and Europe as high end residential kitchen counter tops. [citation needed]

  5. How to Clean Quartz, Granite, Marble, and Butcher Block ... - AOL

    www.aol.com/lifestyle/clean-quartz-granite...

    Follow our guide to keep your quartz, granite, marble, and butcher block countertops looking brand new for years. The post How to Clean Quartz, Granite, Marble, and Butcher Block Countertops ...

  6. Thermal diffusivity - Wikipedia

    en.wikipedia.org/wiki/Thermal_diffusivity

    Thermal diffusivity is usually denoted by lowercase alpha ... Quartz: 1.4 [15] Sandstone 1.15 Ice at 0 °C 1.02 Silicon dioxide (polycrystalline) 0.83 [15]

  7. Granite Mountain (Texas) - Wikipedia

    en.wikipedia.org/wiki/Granite_Mountain_(Texas)

    Granite Mountain is a solid dome, also known as a bornhardt, of pink granite (pink granite is also known as Sunset Red) rising over 860 feet one mile west of Marble Falls, Texas. Since quarry operations began in the late 19th century, the distinctive pink-red colored rock has been used in the construction of the Texas State Capitol in Austin ...