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Definition of glauconite : The green mineral characteristic of the greensand of the chalk and other formations. It is a hydrous silicate of iron and potash. See Greensand.

Synonyms:

clay, calcite, lime, mica, talcum, chromite, bauxite, corundum, azurite, iolite, lazurite, peat, asbestos, alabaster, fluorspar, fluorite, coke, silicate, silica, emery, obsidian, garnet, fool's gold, barite, selenite, gypsum, feldspar, quicklime, kaolinite, aragonite, carbon, spar, mineral, lignite, pitchblende, pyroxene, pyrite, pumice, hornblende, molybdenite, brookite, magnesite, orthoclase, cryolite, chlorite, salt, coal, diatomite, boron, brimstone, quartz, cobalt, ozocerite, graphite, vermiculite, sulfur, chalcedony, crystal, rhodonite, manganese