SHOAD-STONE, noun A small ston, smooth, of a dark liver color with a shade of purple. Shoad-stoners are loose masses found at the entrances of mines, sometimes running in a straight line from the surface to a vein of ore. They appear to be broken from the strata or larger massess; they usually contain mundic, or marcastic matter, and a portion of the ore of the mine.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.