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An element of the chromium group, found in certain rare minerals, as pitchblende, uranite, etc., and reduced as a heavy, hard, nickel-white metal which is quite permanent. Its yellow oxide is used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is us…

A lemon-yellow phosphate of uranium and calcium occurring in tabular crystals with basal cleavage, and in micalike scales. H., 2- 2.5. Sp. gr., 3.05-3.19.

Radiations first observed by the French physicist Henri Becquerel, in working with uranium and its compounds. They consist of a mixture of alpha, beta, and gamma rays.

eral with a metallic luster, found in Norway. It contains niobium, titanium, yttrium, and uranium, with some other metals.

A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite.

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

as of the plot or personages of a play; introductory. = 32,500 yrs.) Also called brevium, Uranium X2 and UX2.

metallic element found (combined) in minute quantities in pitchblende, and various other uranium minerals. Symbol, Ra; atomic weight, 226.4. Radium was discovered by M. and Mme. Curie, of Paris, who in 1902 separated compounds of it by a tedious process from pitchblende. Its compounds color flames carmine and give a c…

A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.

rties in an inferior degree and not malleable, as arsenic, antimony, bismuth, molybdenum, uranium, etc. [Obs.]

emerald-green tabular crystals having a micaceous structure. It is a hydrous phosphate of uranium and copper. Called also copper uranite, and chalcolite.

A yellow, earthy incrustation, consisting essentially of the oxide of uranium, but more or less impure.

Pertaining to, resembling, or containing uranium; specifically, designating those compounds in which uranium has a valence relatively higher than in uranous compounds.

as a dye; -- so called from the peculiar yellowish green fluorescence (resembling that of uranium glass) of its solutions. See Fluorescein.

A mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende.

A general term for the uranium phosphates, autunite, or lime uranite, and torbernite, or copper uranite.

Of or pertaining to uranium; containing uranium.

A combining form (also used adjectively) from uranium; -- used in naming certain complex compounds; as in uranoso-uranic oxide, uranoso-uranic sulphate.

Pertaining to, or containing, uranium; designating those compounds in which uranium has a lower valence as contrasted with the uranic compounds.

The radical UO2, conveniently regarded as a residue of many uranium compounds.