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Concretionary Structure

a condition in rocks produced by molecular aggregation subsequent to the deposition of the strata, whereby the material of the aggregation subsequent to the deposition stone and the somewhat similar strucstone and the somewhat similar strucrock is formed into spherules or balls, tures occasionally seen in certain tuffs and crystalline igneous rocks. Concretions are nodules, balls, or irregular masses of various kinds which occur scattered through the body of a rock, and consist of mineral matter which was formerly diffused through the material of the rock.