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n the free state as a reducer, and as a means of obtaining other metals (as magnesium and aluminium) is an important commercial product. Symbol Na (Natrium). Atomic weight 23. Specific gravity 0.97. Sodium amalgam, an alloy of sodium and mercury, usually produced as a gray metallic crystalline substance, which is used…

e, brown, and black, the red variety being the gem spinel ruby. It consist essentially of alumina and magnesia, but commonly contains iron and sometimes also chromium.

ald-green color, occuring in prismatic crystals, often of great size. It is a silicate of aluminia and lithia. See Hiddenite.

atic crystals, often twinned so as to form groups resembling a cross. It is a silicate of aluminia and iron, and is generally found imbedded in mica schist. Called also granatite, and grenatite.

A common mineral of the zeolite family, a hydrous silicate of alumina and lime, usually occurring in sheaflike aggregations of crystals, also in radiated masses. It is of a white or yellowish color, with pearly luster on the cleavage surface. Called also desmine.

lates, also in velvety bronze-colored incrustations. It is a hydrous silicate of iron and alumina.

False accusation; calumniation; talebearing. [Obs.] Bp. Hall.

To inform against; hence, to calumniate. [Obs.] Sycophanting and misnaming the work of his adversary. Milton.

Of or pertaining to tantalum; derived from, or containing, tantalum; specifically, designating any one of a series of acids analogous to nitric acid and the polyacid compounds of phosphorus.

he skins of sheep, lambs, goats, and kids, for gloves, and the like, by imbuing them with alum, salt, and other agents, for softening and bleaching them.

[L., white earth] (Com.), a white amorphous earthy substance consisting of burnt gypsum, aluminium silicate (kaolin), or some similar ingredient, as magnesia. It is sometimes used to adulterate certain foods, spices, candies, paints, etc. -- Terra cotta. Etym: [It., fr. terra earth + cotta, fem. of cotto cooked, L. c…

A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7.…

ive of thiophene obtained as a white crystalline substance, (C4H3S)2.CO, by the action of aluminium chloride and carbonyl chloride on thiophene.

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

neral, occurring generally in masses of a radiated structure. It is a hydrous silicate of aluminia, lime, and soda. Called also mesole, and comptonite.

minute scales having an olive-green color and pearly luster. It is a hydrous silicate of aluminia and iron.

uish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem.

To expose to contempt or shame; to represent as blamable; to calumniate; to vilify; to defame. The best stratagem that Satan hath . . . is by traducing the form and manner of them [prayers], to bring them into contempt. Hooker. He had the baseness . . . to traduce me in libel. Dryden.

The act of traducing; misrepresentation; ill-founded censure; defamation; calumny. [R.] Shak.

One who traduces; a slanderer; a calumniator. Bp. Hall.