found: Wikipedia, Aug. 12, 2012:Thorium dioxide (Thorium dioxide (ThO₂), also called thorium(IV) oxide is a white, crystalline powder. It was formerly known as thoria or thorina. It is produced mainly as a by-product of lanthanide and uranium production. Thorianite is the name of the mineralogical form of thorium dioxide. The compound is radioactive due to the radioactivity of thorium. IUPAC name: Thorium dioxide; Thorium(IV) oxide. Other names: thoria; thorium anhydride) Thorium (under Compounds: Thorium dioxide has the highest melting point (3300 °C) of all oxides.)
found: The American heritage dict. of the English lang., c2000, via TheFreeDictionary.com, Aug. 12, 2012(thorium dioxide: A heavy white powder, ThO₂, obtained from monazite and used mainly in ceramics, glass, and gas mantles and as a catalyst. Also called thoria; thorianite: A highly radioactive blackish, greenish, or yellow mineral, ThO₂, isomorphous with uraninite.)
found: Physical constants of thorium dioxide, via International Bio-Analytical Industries, Inc. website, Aug. 12, 2012(Chemical Name: Thorium (IV) oxide (99.99%-Th); Chemical Family: metal oxide. Synonym: Thorium dioxide, thoria, thorianite)
found: McGraw-Hill dictionary of scientific & technical terms, ©2003, via TheFreeDictionary.com, Aug. 12, 2012(thorianite (mineralogy) ThO₂ A radioactive mineral that crystallizes in the isometric system, occurs in worn cubic crystals, is brownish black to reddish brown in color, and has resinous luster; hardness is 7 on the Mohs scale, and specific gravity is 9.7-9.8.)
found: The Columbia electronic encyclopedia, ©2007, via TheFreeDictionary.com, Aug. 13, 2012(Thorium forms numerous compounds with other elements. The most important thorium compound is the oxide (thoria, ThO₂), which is the major incandescent component of the Welsbach mantle; it is also used in crucibles, in special highly refractive optical glass, and in catalysts for several industrially important chemical reactions.)
