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ntary substance found as an oxide in the mineral cassiterite, and reduced as a soft white crystalline metal, malleable at ordinary temperatures, but brittle when heated. It is not easily oxidized in the air, and is used chiefly to coat iron to protect it from rusting, in the form of tin foil with mercury to form the re…

lated both to the acetylene and the aromatic series, and produced artificially as a white crystalline substance; -- called also diphenyl acetylene.

H3.C6H4.CO2H, which are related to toluene and analogous to benzoic acids. They are white crystalline substances, and are called respectively orthotoluic acid, metatoluic acid, and paratoluic acid.

A complex double tolyl and toluidine derivative of glycocoll, obtained as a white crystalline substance.

atoluidine; especially, the commonest one, or paratoluidine, which is obtained as a white crystalline substance.

Of, pertaining to, or designating, any one of three isomeric crystalline acids, C9H10ON.CO2H, which are toluyl derivatives of glycocoll.

A mineral occurring in emerald-green tabular crystals having a micaceous structure. It is a hydrous phosphate of uranium and copper. Called also copper uranite, and chalcolite.

al system, bounded by six trapezoidal planes. The faces of this form are common on quartz crystals.

A mass of crystals, aggregated in arborescent forms, obtained by precipitation of a metal from solution. See Lead tree, under Lead. Tree bear (Zoöl.), the raccoon. [Local, U.S.] -- Tree beetle (Zoöl.) any one of numerous species of beetles which feed on the leaves of trees and shrubs, as the May beetles, the rose beetl…

A white variety of amphibole, or hornblende, occurring in long, bladelike crystals, and coarsely fibrous masses.

A colorless crystalline substance prepared by the reaction of carbolic acid with bromine.

urring naturally in unripe beet roots, and produced artificially from glycerin as a white crystalline substance.

A kind of crystallite resembling a bunch of hairs, common in obsidian. See Illust. of Crystallite.

The quality possessed by some crystals of presenting different colors in three different directions.

r characterized by, three unequal axes intersecting at oblique angles. See the Note under crystallization.

, or designating, that acid of the fatty acids heterologous with tridecane. It is a white crystalline substance.

Pure silica, like quartz, but crystallizing in hexagonal tables. It is found in trachyte and similar rocks.

4H7N3O2, obtained, by the action of the vapor of cyanic acid on cold aldehyde, as a white crystalline substance having a slightly acid taste and faint smell; -- called also ethidene- or ethylidene-biuret.

A compound crystal, consisting of three individuals.

C6H3.(CO2)3, of the aromatic series, obtained, by the oxidation of mesitylene, as a white crystalline substance. [Written also trimesic.]