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some coloring matter, usually by precipitation, with a metallic oxide or earth, esp. with aluminium hydrate; as, madder lake; Florentine lake; yellow lake, etc.

A rare element of the group of the earth metals, allied to aluminium. It occurs in certain rare minerals, as cerite, gadolinite, orthite, etc., and was so named from the difficulty of separating it from cerium, didymium, and other rare elements with which it is usually associated. Atomic weight 138.5. Symbol La. [Forme…

A mineral, of a white color and vitreous luster. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles. [Written also laumonite.]

a fine azure-blue color, usually in small rounded masses. It is essentially a silicate of alumina, lime, and soda, with some sodium sulphide, is often marked by yellow spots or veins of sulphide of iron, and is much valued for ornamental work. Called also lapis lazuli, and Armenian stone.

rring in small masses, or in monoclinic crystals; blue spar. It is a hydrous phosphate of alumina and magnesia.

Of or pertaining to the isle of Lemnos. Lemnian bole, Lemnian earth, an aluminous earth of a grayish yellow color; sphragide; -- formerly sold as medicine, having astringent properties. -- Lemnian reddle, a reddle of firm consistence and deep red color; -- used by artificers in coloring.

from the outer surface of a plate composed of any material permeable by cathode rays, as aluminium, which forms a portion of a wall of a vacuum tube, or which is mounted within the tube and exposed to radiation from the cathode. Lenard rays are similar in all their known properties to cathode rays. So called from the…

g a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius.

A South European plant of the genus Leontice (L. leontopetalum), the tuberous roots of which contain so much alkali that they are sometimes used as a substitute for soap.

coal, and partly the result of vegetable decomposition; honeystone. It is a mellitate of alumina.

white, crystalline, organic substance, C6(CO2H)6, occurring naturally in combination with aluminium in the mineral mellite, and produced artificially by the oxidation of coal, graphite, etc., and hence called also graphitic acid.

ccuring in delicate groups of crystals, also fibrous massive. It is a hydrous silicate of alumina, lime, and soda.

sodium, lithium, calcium, magnesium, etc.; also, sometimes, the metals of the earths, as aluminium. -- Muntz metal, an alloy for sheathing and other purposes, consisting of about sixty per cent of copper, and forty of zinc. Sometimes a little lead is added. It is named from the inventor. -- Prince's metal (Old Chem.…

A binary compound of methyl with some element; as, aluminium methide, Al2(CH3)6.

An alloy consisting of copper, nickel, tungsten, and aluminium; -- used by jewelers.

To give untrue information; (with against) to calumniate. [R.] Bp. Montagu.

ng malleable iron castings by melting wrought iron, to which from 0.05 to 0.1 per cent of aluminium is added to lower the melting point, usually in a petroleum furnace, keeping the molten metal at the bubbling point until it becomes quiet, and then pouring the molten metal into a mold lined with a special mixture consi…

Any substance, as alum or copperas, which, having a twofold attraction for organic fibers and coloring matter, serves as a bond of union, and thus gives fixity to, or bites in, the dyes.

rystals, and in masses which often have a radiated structure. It is a hydrous silicate of alumina and soda.

ilver, and consisting chiefly of copper, zinc, and nickel, with small proportions of tin, aluminium, and bismuth. Ure.