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One of the portions of space bounded by the three coordinate planes. Specif. (Crystallog.), one of the parts of a crystal into which it is divided by the axial planes.

mass, and collect together about centers or along lines of fracture, as in the process of crystallization or solidification.

, and gathering about centers or into cavities at hand through cohesive attraction or the crystallizing process.

A variety of gypsum, occuring in transparent crystals or crystalline masses.

sulphur and some sulphur ores, and obtained in the free state as a dark reddish powder or crystalline mass, or as a dark metallic- looking substance. It exhibits under the action of light a remarkable variation in electric conductivity, and is used in certain electric apparatus. Symbol Se. Atomic weight 78.9.…

Half crystalline; -- said of certain cruptive rocks composed partly of crystalline, partly of amorphous matter.

Half formed; imperfectly formed; as, semiformed crystals.

A hydrocarbon (C13H10) obtained in white fluorescent crystals, in the distillation products of the needles of the California "big tree" (Sequoia gigantea).

A white crystalline nitrogenous substance obtained by the action of dilute sulphuric acid on silk gelatin.

uddenly; especially, to solidify. If the menstruum be overcharged, metals will shoot into crystals. Bacon.

judgment; as, the vote was taken by a show of hands. -- Show stone, a piece of glass or crystal supposed to have the property of exhibiting images of persons or things not present, indicating in that way future events.

an important ore of iron occuring generally in cleavable masses, but also in rhombohedral crystals. It is of a light yellowish brown color. Called also sparry iron, spathic iron.

cially obtained in the free state, usually as a dark brown amorphous powder, or as a dark crystalline substance with a meetallic luster. Its oxide is silica, or common quartz, and in this form, or as silicates, it is, next to oxygen, the most abundant element of the earth's crust. Silicon is characteristically the elem…

e seeds of white mustard (Brassica alba, formerly Sinapis alba), and extracted as a white crystalline substance.

A bitter white crystalline nitrogenous substance, obtained indirectly from oil of mustard and ammonia; -- called also allyl melamine.

1H12O5) related to gallic acid, and obtained by the decomposition of sinapine, as a white crystalline substance.

the seeds of mustard. It is extracted, in combination with sulphocyanic acid, as a white crystalline substance, having a hot, bitter taste. When sinapine is isolated it is unstable and undergoes decomposition.

2, related to urea, extracted from mustard oil, and also produced artifically, as a white crystalline substance; -- called also diallyl urea.

ines; having only certain leading features of anything; as, a skeleton sermon; a skeleton crystal. Skeleton bill, a bill or draft made out in blank as to the amount or payee, but signed by the acceptor. [Eng.] -- Skeleton key, a key with nearly the whole substance of the web filed away, to adapt it to avoid the wards o…

ve undergone. -- Slaty gneiss (Min.), a variety of gneiss in which the scales of mica or crystals of hornblende, which are usually minute, form thin laminæ, rendering the rock easily cleavable.