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A mineral occuring in glassy rhombohedral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie.

A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax. [Written also calcedony.]

re of opper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color.

The tender leaves or leafstalks of the artichoke, white beet, etc., blanched for table use.

ained from the celandine, and named from the red color of its salts, It is a coloriess crystalline substance, and acts as an acrid narcotic poison. It is identical with sanguinarine.

eidonic acid, a weak acid extracted fron the celandine (Chelidonium majus), as a white crystalline substance.

The mineral azurite, found in fine crystallization at Chessy, near Lyons; called also chessylite.

A variety of feldspar found in crystals in the county of Chester, Pennsylvania.

pperance of a cross section is due to the symmetrical arrangement of impurities in the crystal.

To produce, by sudden cooling, a change of crystallization at or near the surface of, so as to increase the hardness; said of cast iron.

Chloral hydrate. Chloral hydrate, a white crystalline substance, obtained by treating chloral with water. It produces sleep when taken internally or hypodermically; -- called also chloral.

A yellow crystalline substance, C6Cl4.O2, regarded as a derivative of quinone, obtained by the action of chlorine on certain benzene derivatives, as aniline.

A white, fatty, crystalline substance, tasteless and odorless, found in animal and plant products and tissue, and especially in nerve tissue, in the bile, and in gallstones.

extracted as a resinous substance, convertible under the influence of ether into white crystals.

te of magnesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone.

Chrome alum (Chem.), a dark violet substance, (SO4)3Cr2.K2SO4.24H2O, analogous to, and crystallizing like, common alum. It is regarded as a double sulphate of chromium and potassium. -- Chrome green (a) The green oxide of chromium, Cr2O3, used in enamel painting, and glass staining. (b) A pigment made by mixing chrome…

ed pigments, as chrome yellow, chrome red, etc. -- Chromic anhydride, a brilliant red crystalline substance, CrO3, regarded as the anhydride of chromic acid. It is one of the most powerful oxidizers known.

aromatic hydrocarbons of coal tar, allied to napthalene and anthracene. It is a white crystalline substance, C18H12, of strong blue fluorescence, but generally colored yellow by impurities.

A mineral, found in crystals, of a yellow to green or brown color, and consisting of aluminia and glucina. It is very hard, and is often used as a gem.

A yellow crystalline substance extracted from crude anthracene.