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drocarbon obtained from coal-tar residues, and remarkable for its intense yellowish green fluorescence.

A beautiful fluorescent crystalline substance, intermediate in composition between thionol and thionine.

A fluoride of aluminium, calcium, and sodium occurring with the cryolite of Greenland.

ertain double compounds of titanium with some other elements; as, titano- cyanide, titano-fluoride, titano-silicate, etc.

A manganese phosphate near triplite, but containing hydroxyl instead of fluorine.

A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.

An alkaline salt of fluorescein, obtained as a brownish red substance, which is used as a dye; -- so called from the peculiar yellowish green fluorescence (resembling that of uranium glass) of its solutions. See Fluorescein.

used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is used as a pigment in porcelain painting. Symbol U. Atomic weight 239.

ineral or rock material which accompanies the ores in a vein, as quartz, calcite, barite, fluor spar, etc.; -- called also veinstuff.

powder; -- so called because it forms yellow salts, and because its solution forms a blue fluorescence like quinine.

A mineral of a violet-blue color, inclining to gray and white. It is a hydrous fluoride of cerium, yttrium, and calcium.

ly) designating zirconium as an element of certain double compounds; zircono-; as in zircofluoric acid, sodium zircofluoride.