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Definition of pitchblende : A pitch- black mineral consisting chiefly of the oxide of uranium; uraninite. See Uraninite.

Synonyms:

uraninite

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

Usage examples:

• These cliffs proved, as Bennie had already suspected, to be a gigantic outcrop of pitchblende or black oxide of uranium. - "The Man Who Rocked the Earth", Arthur Train Robert Williams Wood.
• The deposits of Joachimsthal, Bohemia, contain pitchblende, along with silver, nickel, and cobalt minerals and other metallic sulphides, in veins associated with igneous intrusions. - "The Economic Aspect of Geology", C. K. Leith.
• The principal ore mineral is uranophane, a hydrated calcium- uranium silicate, which is believed to be an oxidation product of pitchblende. - "The Economic Aspect of Geology", C. K. Leith.