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  1. A general name for sedimentary rocks composed of sand-sized fragments irrespective of composition; e.g., sandstone, graywacke, arkose, and calcarenite. AGI
  2. A clean sandstone that is well sorted, contains little or no matrix material, and has a relatively simple mineralogic composition; specif. a pure or nearly pure, chemically cemented sandstone containing less than 10% argillaceous matrix and inferred to represent a slowly deposited sediment well-washed by currents.---Etymol: Latin arena, sand. Adj. arenitic. See also: lutite
    Source: Dictionary of Mining, Mineral, and Related Terms

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