a. A coarse-grained sandstone, esp. one composed of angular particles; e.g., a breccia composed of particles ranging in diameter from 2 to 4 mm. AGI b. A sand or sandstone made up of angular grains that may be coarse or fine. The term has been applied to any sedimentary rock that looks or feels gritty on account of the angularity of the grains. AGI c. A sandstone composed of particles of conspicuously unequal sizes (including small pebbles or gravel). AGI d. A sandstone with a calcareous cement. The term has been applied incorrectly to any nonquartzose rock resembling a grit; e.g., pea grit or a calcareous grit. AGI e. A small particle of a stone or rock; esp. a hard, angular granule of sand. Also, an abrasive composed of such granules. AGI f. The structure or grain of a stone that adapts it for grinding or sharpening; the hold of a grinding substance. Also, the size of abrasive particles, usually expressed as their mesh number. AGI g. An obsolete term for sand or gravel, and for earth or soil. The term is vague and has been applied widely with many different connotations. Etymol: Old English greot, gravel, sand. AGI
Source: Dictionary of Mining, Mineral, and Related Terms












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