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mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; -- also called feather alum, and hair salt.

An explosive consisting of a mixture of powdered aluminium and nitrate of ammonium.

ent plant, or the part of it used as a detergent, as the roots of Agave Americana, Chlorogalum pomeridianum, etc. [Sp. Amer. & Mex.]

the ancients to kill insects, etc., on vines; -- applied by Brongniart to a carbonaceous alum schist.

to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some common varieties are tremolite, actinolite, asbestus, edenite, hornblende (the last name being also used as a general term for the whole species). Amphibole is a constituent of many crystalline rocks, as s…

A silicate of aluminium, occurring usually in thick rhombic prisms, nearly square, of a grayish or pale reddish tint. It was first discovered in Andalusia, Spain.

related to orthoclase, but triclinic. It is chiefly a silicate of sodium, potassium, and aluminium. Sp. gr., 2.57 -- 2.60.

A (patented) alloy of aluminium and silver, with a density of about 2.9.

Clay, or potter's earth; sometimes pure clay, or alumina. See Clay.

lse and injurious charges; to tarnish in point of reputation or good name; to slander or calumniate; as, to asperse a poet or his writings; to asperse a man's character. With blackest crimes aspersed. Cowper.

Bespattered; slandered; calumniated. Motley.

The spreading of calumniations reports or charges which tarnish reputation, like the bespattering of a body with foul water; calumny. Every candid critic would be ashamed to cast wholesale aspersions on the entire body of professional teachers. Grote. Who would by base aspersions blot thy virtue. Dryden.…

A borosilicate of alumina, iron, and lime, commonly found in glassy, brown crystals with acute edges.

One who backbites; a secret calumniator or detractor.

t smell. It is valued as an unguent and cosmetic by the Turks. The fragrant herb Dracocephalum Canariense is familiarly called balm of Gilead, and so are the American trees, Populus balsamifera, variety candicans (balsam poplar), and Abies balsamea (balsam fir).

A ferruginous hydrate of alumina. It is largely used in the preparation of aluminium and alumina, and for the lining of furnaces which are exposed to intense heat.

To libel or traduce; to calumniate. Fuller.

To tell lie about; to calumniate; to slander. Thou dost belie him, Percy, thou dost belie him. Shak.

y of a green or bluish green color, but also yellow, pink, and white. It is a silicate of aluminium and glucinum (beryllium). The aquamarine is a transparent, sea-green variety used as a gem. The emerald is another variety highly prized in jewelry, and distinguished by its deep color, which is probably due to the prese…

To asperse with calumny or reproach. Whom never faction could bespatter. Swift.