CLAY-STONE, noun A mineral, the thonstein of Werner, and indurated clay of Kirwan. It resembles compact limestone or calcarious marl. Its texture is porous, compact or slaty. Its color is gray, often tinged with yellow or blue; also rose or pale red, or brownish red, and sometimes greenish.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.