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Definition of brookite : A mineral consisting of titanic oxide, and hence identical with rutile and octahedrite in composition, but crystallizing in the orthorhombic system.

Synonyms:

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