. . . "Sediment that consists of at least 50 percent iron-bearing minerals (hematite, magnetite, limonite-group, siderite, iron-sulfides), as determined by hand-lens or petrographic analysis. Corresponds to a rock typically containing 15 percent iron by weight."@en . "Sediment that consists of at least 50 percent iron-bearing minerals (hematite, magnetite, limonite-group, siderite, iron-sulfides), as determined by hand-lens or petrographic analysis. Corresponds to a rock typically containing 15 percent iron by weight."@en . "http://inspire.ec.europa.eu/codelist/LithologyValue/ironRichSediment"^^ . "2015-08-18 18:03 PM CEST"^^ . . "iron rich sediment"@en . . . "iron rich sediment"@en . . . . . . . .