from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A usually pinkish or red sandstone consisting primarily of quartz and feldspar and forming from the cementation of particles generated by the rapid erosion of granite.

from The Century Dictionary.

  • noun Feldspathic sandstone; a rock consisting essentially of more or less consolidated quartzose sand with grains or particles of orthoclase disseminated through it, and frequently containing also some mica and kaolin.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Petrog) A sandstone derived from the disintegration of granite or gneiss, and characterized by feldspar fragments.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology A sedimentary rock consisting of small fragments of feldspar and quartz similar to a coarse sand.


from The American Heritage® Dictionary of the English Language, 4th Edition

[French, perhaps from alteration of Greek arkhaios, ancient.]


  • Uluru is composed of steeply dipping, feldspar-rich sandstone arkose and has been exposed as a result of folding, faulting, the erosion of surrounding rock and infill.

    Uluru-Kata Tjuta National Park, Australia

  • The Triassic rocks are mainly red sandstones, -- often feldspathic, or arkose, with some conglomerates and shales.

    The Elements of Geology

  • Pressure has hardened the marine muds, the arkose, or the volcanic ash from which slates are derived, and has caused them to cleave by the rearrangement of their particles.

    The Elements of Geology


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