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The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.

A fluoride of sodium and aluminum, found in Greenland, in white cleavable masses; -- used as a source of soda and alumina.

thin-bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium. [Written also kyanite.]

A hydrous carbonate of alumina and soda, occuring in white, bladed crustals.

r oral; the wrong of maliciously injuring the good name of another; slander; detraction; calumny; aspersion.

Containing defamation; injurious to reputation; calumnious; slanderous; as, defamatory words; defamatory writings.

isgrace; especially, to speak evil of maliciously; to dishonor by slanderous reports; to calumniate; to asperse.

One who defames; a slanderer; a detractor; a calumniator.

To take credit or reputation from; to defame. That calumnious critic . . . Detracting what laboriously we do. Drayton.

ening in the estimation of others; the act of depreciating another, from envy or malice; calumny.

Defamatory by denial of desert; derogatory; calumnious. Sir T. Browne.

A hydrate of alumina, often occurring in white lamellar masses with brilliant pearly luster; -- so named on account of its decrepitating when heated before the blowpipe.

A sort of stone, found in the mines with the true alum rock, chiefly of silica and iron.

and potassium, NaKCO3.6H2O. (b) A molecular combination of two distinct salts, as common alum, which consists of the sulphate of aluminium, and the sulphate of potassium or ammonium. -- Double shuffle, a low, noisy dance. -- Double standard (Polit. Econ.), a double standard of monetary values; i. e., a gold standard…

Any earthy-looking metallic oxide, as alumina, glucina, zirconia, yttria, and thoria.

A grayish white zeolitic mineral, in tetragonal crystals. It is a hydrous silicate of alumina and baryta.

terness, malice, or hatred; to imbue as with venom; to imbitter. The envenomed tongue of calumny. Smollett. On the question of slavery opinion has of late years been peculiarly envenomed. Sir G. C. Lewis.

A hydrous phosphate of alumina and manganese. It is generally of a rose-pink color, -- whence the name.

r, occurring granular, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese.

A crystallized, transparent mineral of the Zeolite family. It is a hydrous silicate of alumina and lime.