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rinded iron-oxide concretions: hallmarks of altered siderite masses of both early and late diagenetic origin dissolution of the reduced iron minerals and precipitation of the goethite took place during cylindrical rinds of iron oxide that cement grain-supported sandstone, and iron oxide ce-
iron-rich sedimentary rocks have economic uses as iron ores. iron deposits have been located on all major continents with the exception of antarctica. they are a major source of iron and are mined for commercial use. the main iron ores are from the oxide group consisting of hematite, goethite, and magnetite.
trace amounts of iron oxide lend himalayan salt its signature ruddy pigment. i don't know about this salt's minerals, but the red in sandstone and clays is usually attributed to iron oxide 'contamination'. i'm sure the mountains to the north are much younger than this salt. read the is pink himalayan salt better than black salt
iron oxide concretions form in porous sandstone by chemical reduction and solution of iron minerals, transport of fe 2 in solution, and precipitation of hydrous ferric oxide by oxidation. concretions form quickly in 1000's of years by diffusion and advection, and k-feldspar consumption of h initiates nucleation.
common mineral cements include calcite, quartz or silica phases like cristobalite, iron oxides, and clay minerals, but other mineral cements also occur. cementation is continuous in the groundwater zone, so much so that the term "zone of cementation" is sometimes used interchangeably.
another common cementing agent in sandstone is iron oxide, also called hematite cement. the iron present in the cement will give the sandstone a distinctive red color. according to the stone care techniques website, iron oxide cemented sandstone weather well in dry climates and become harder and stronger, resisting weathering and deterioration.