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Gelseminic :: Gelseminic (n.) Pertaining to, or derived from, the yellow jasmine (Gelsemium sempervirens); as, gelseminic acid, a white crystalline substance resembling esculin..

Pinacoid :: Pinacoid (n.) A plane parallel to two of the crystalline axes.

Tysonite :: Tysonite (n.) A fluoride of the cerium metals occurring in hexagonal crystals of a pale yellow color. Cf. Fluocerite.

Pseudo-cone :: Pseudo-cone (n.) One of the soft gelatinous cones found in the compound eyes of certain insects, taking the place of the crystalline cones of others..

Protocatechuic :: Protocatechuic (a.) Pertaining to, derived from, or designating, an organic acid which is obtained as a white crystalline substance from catechin, asafetida, oil of cloves, etc., and by distillation itself yields pyrocatechin..

Crystal :: Crystal (n.) The material of quartz, in crystallization transparent or nearly so, and either colorless or slightly tinged with gray, or the like; -- called also rock crystal. Ornamental vessels are made of it. Cf. Smoky quartz, Pebble; also Brazilian pebble, under Brazilian..

Cleavage :: Cleavage (n.) The quality possessed by many crystallized substances of splitting readily in one or more definite directions, in which the cohesive attraction is a minimum, affording more or less smooth surfaces; the direction of the dividing plane; a fragment obtained by cleaving, as of a diamond. See Parting..

Alcoholate :: Alcoholate (n.) A crystallizable compound of a salt with alcohol, in which the latter plays a part analogous to that of water of crystallization..

Stilbite :: Stilbene (n.) A hydrocarbon, C14H12, produced artificially in large, fine crystals; -- called also diphenyl ethylene, toluylene, etc..

Oxalantin :: Oxalantin (n.) A white crystalline nitrogenous substance (C6H4N4O5) obtained by the reduction of parabanic acid; -- called also leucoturic acid.

Gentisin :: Gentisin (n.) A tasteless, yellow, crystalline substance, obtained from the gentian; -- called also gentianin..

Lactamide :: Lactamide (n.) An acid amide derived from lactic acid, and obtained as a white crystalline substance having a neutral reaction. It is metameric with alanine..

Onocerin :: Onocerin (n.) A white crystalline waxy substance extracted from the root of the leguminous plant Ononis spinosa.

Willemite :: Willemite (n.) A silicate of zinc, usually occurring massive and of a greenish yellow color, also in reddish crystals (troostite) containing manganese..

Effloresce :: Effloresce (v. i.) To change on the surface, or throughout, to a whitish, mealy, or crystalline powder, from a gradual decomposition, esp. from the loss of water, on simple exposure to the air; as, Glauber's salts, and many others, effloresce..

Phenol :: Phenol (n.) A white or pinkish crystalline substance, C6H5OH, produced by the destructive distillation of many organic bodies, as wood, coal, etc., and obtained from the heavy oil from coal tar..

Belonite :: Belonite (n.) Minute acicular or dendritic crystalline forms sometimes observed in glassy volcanic rocks.

Natrolite :: Natrolite (n.) A zeolite occuring in groups of glassy acicular crystals, and in masses which often have a radiated structure. It is a hydrous silicate of alumina and soda..

Naphthalene :: Naphthalene (n.) A white crystalline aromatic hydrocarbon, C10H8, analogous to benzene, and obtained by the distillation of certain bituminous materials, such as the heavy oil of coal tar. It is the type and basis of a large number of derivatives among organic compounds. Formerly called also naphthaline..

Acetamide :: Acetamide (n.) A white crystalline solid, from ammonia by replacement of an equivalent of hydrogen by acetyl..

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