ironstone

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ironstone Iron-rich sedimentary rock. The source of the iron is primary and/or diagenetic (see DIAGENESIS), developed by a number of possible processes. These include: (a) replacement of carbonate particles by hematite, siderite, or chamosite; (b) diagenetic development of nodules, and more continuous horizons, of siderite within claystone sequences; (c) primary deposition of ooids from Fe/Alrich gels, and subsequent conversion to chamosite during shallow burial. See PLINTHITE. See also MINETTE; and CLINTON IRONSTONE.

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i·ron·stone / ˈīərnˌstōn/ • n. 1. sedimentary rock containing a substantial proportion of iron compounds. 2. [usu. as adj.] a kind of dense, opaque stoneware.

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ironstone. Stone containing iron-ore, which influences colour (e.g. brown, brownish-red, etc.).