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graywacke    
n. 硬砂岩

硬砂岩


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  • Greywacke - Wikipedia
    Greywackes are mostly grey, brown, yellow, or black, dull-colored sandy rocks that may occur in thick or thin beds along with shales and limestones Some varieties include feldspathic greywacke, rich in feldspar, and lithic greywacke, rich in other tiny rock fragments
  • Greywacke Rock | Properties, Formation, Uses - Geology Science
    Graywacke sandstone is a sedimentary rock that is made up mosttly of sand-size grains that were rapidly deposited very near the source rock grom which they were weathered
  • Graywacke Sandstone FAQ - U. S. National Park Service
    Graywacke sandstone is a sedimentary rock that is made up mostly of sand-size grains that were rapidly deposited very near the source rock from which they were weathered
  • Sedimentary rock - Wackes, Stratification, Deposition | Britannica
    Sedimentary rock - Wackes, Stratification, Deposition: Wacke, or graywacke, is the name applied to generally dark-coloured, very strongly bonded sandstones that consist of a heterogeneous mixture of rock fragments, feldspar, and quartz of sand size, together with appreciable amounts of mud matrix
  • Greywacke: Mineral information, data and localities. - mindat. org
    Graywackes are typically interbedded with marine shales or slates, and associated with submarine lava flows and bedded cherts; they are generally of marine origin and are believed to have been deposited by submarine turbidity currents Also spelled: graywacke; grauwacke A petrological term for Feldspar Group
  • Geology - rocks and minerals - University of Auckland
    Greywacke is a variety of argillaceous sandstone that is highly indurated and poorly sorted It comprises a large percentage of the basement rock of New Zealand, and so is an important rock type throughout the country
  • Greywacke the world’s most boring rock - Nelson Rock and Mineral Club
    Early ideas were that greywackes were shallow water deposits, laid down in near-shore areas by streams Later, theory of diastrophism led to belief that they were associated with geosynclines (deep subsiding basins), which then were uplifted by compressive forces to create new mountain ranges
  • Greywacke vs. Shale - Whats the Difference? | This vs. That
    Greywacke is a type of sandstone that contains a high percentage of clay minerals, giving it a dark grey color and a gritty texture Shale, on the other hand, is a fine-grained rock that is composed of clay minerals and silt-sized particles
  • Greywacke - Institut für Geowissenschaften
    Greywacke is a gray to green-gray rock consisting mainly of sandstone with a high proportion of feldspar and matrix The term "Grauwacke" originates from the miners' language of the Harz region and is usually used for rocks belonging to the Paleozoic or an older geological period
  • Greywacke - Rock Identifier
    Greywacke is a hard, dark-colored variety of sandstone sometimes used as a filler in construction Taking on a subdued but attractive look when cut or polished, greywacke is sometimes used for flooring, decorative tiles, or flagstones It may also be used in roads or seawalls





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