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|(Min.)||cleavage, as of rocks, into thin leaves or plates, like those of slate; - applied especially to those cases in which the planes of cleavage are not parallel to the planes of stratification. It is now believed to be caused by the compression which the strata have undergone.|
See also: Slaty
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.