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  2. Wikipedia:Pro and con lists - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Pro_and_con_lists

    A number of Wikipedia articles contain pro and con lists: lists of arguments for and against some particular contention or position.These take several forms, including lists of advantages and disadvantages of a technology; pros and cons of a proposal which may be as technical as Wi-Fi or otherwise; and lists of criticisms and defenses of a political position or other view (such as socialism or ...

  3. QFL diagram - Wikipedia

    en.wikipedia.org/wiki/Qfl_diagram

    As first demonstrated in the 1979 paper by Bill Dickinson and Chris Suczek, [1] the composition and provenance of a sandstone is directly related to its tectonic environment of formation. Craton sands are clustered near the Q pole. As sandstones, these are known as quartz arenites. Transitional continental sands are along the QF line.

  4. Sandstone - Wikipedia

    en.wikipedia.org/wiki/Sandstone

    A QFL chart is a representation of the framework grains and matrix that is present in a sandstone. This chart is similar to those used in igneous petrology. When plotted correctly, this model of analysis creates a meaningful quantitative classification of sandstones. [24] A sandstone provenance chart is typically based on a QFL chart but allows ...

  5. Countertop - Wikipedia

    en.wikipedia.org/wiki/Countertop

    Tests also have shown that this countertop surface is the most resistant to discoloration from foods and household products among common household surfaces, the second most stain resistant being granite. [3] Countertops are custom made and more scratch resistant as well as less porous than natural quartz surfaces, and don't need to be sealed ...

  6. Ashlar - Wikipedia

    en.wikipedia.org/wiki/Ashlar

    Dry ashlar masonry laid in parallel courses on an Inca wall at Machu Picchu Ashlar masonry north gable of Banbury Town Hall, Oxfordshire Ashlar polygonal masonry in Cuzco, Peru Quarry-faced red Longmeadow sandstone in random ashlar was specified by architect Henry Hobson Richardson for the North Congregational Church (Springfield, Massachusetts, 1871).

  7. Concretion - Wikipedia

    en.wikipedia.org/wiki/Concretion

    Vaqueros Formation sandstone with concretions A mosaic of images showing spherules, some partly embedded, spread over (smaller) soil grains on the Martian surface. Concretions are found in a variety of rocks, but are particularly common in shales, siltstones, and sandstones. [30]

  8. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Blue Granite – Variety of monzonite, an igneous rock; Epidosite – Hydrothermally altered epidote- and quartz-bearing rock; Felsite – Very fine-grained volcanic rock that sometimes contains larger crystals; Flint – Cryptocrystalline form of the mineral quartz; Ganister – Hard, fine-grained quartzose sandstone, or orthoquartzite

  9. Navajo Sandstone - Wikipedia

    en.wikipedia.org/wiki/Navajo_Sandstone

    The Navajo Sandstone is a geological formation in the Glen Canyon Group that is spread across the U.S. states of southern Nevada, northern Arizona, northwest Colorado, and Utah as part of the Colorado Plateau province of the United States.