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A plane parallel to two of the crystalline axes.

A white crystalline substance related to the glycols, and made from acetone; hence, by extension, any one of a series of substances of which pinacone proper is the type. [Written also pinakone.]

A compact granular cryptocrystalline mineral of a dull grayish or greenish white color. It is a hydrous alkaline silicate, and is derived from the alteration of other minerals, as iolite.

A crystalline substance, (C2H4NH)2, formed by action of ammonia on ethylene bromide, by reduction of pyrazine, etc. It is a strong base, and is used as a remedy for gout.

d in the products of different members of the Pepper family, and extracted as a yellowish crystalline substance.

A white crystalline compound of piperidine and piperic acid. It is obtained from the black pepper (Piper nigrum) and other species.

A white crystalline substance obtained by oxidation of piperic acid, and regarded as a complex aldehyde.

cid consisting of platinic chloride and hydrochloric acid, and obtained as a brownish red crystalline substance, called platinichloric, or chloroplatinic, acid.

acid compound of platinous cyanide and hydrocyanic acid. It is obtained as a cinnaber-red crystalline substance.

A crystalline substance said to be found in the root of a certain plant of the Leadwort (Plumbago) family.

nd in the bark of certain species of the poplar (Populus), and extracted as a sweet white crystalline substance.

feldspar, quartz, or augite, in a relatively fine-grained base, often aphanitic or cryptocrystalline.

rbonate obtained by leaching wood ashes, either as a strong solution (lye), or as a white crystalline (pearlash).

A variety of cryptocrystalline of a leek-green color.

oat at or near the surface. Red precipitate (Old. Chem), mercuric oxide (HgO) a heavy red crystalline powder obtained by heating mercuric nitrate, or by heating mercury in the air. Prepared in the latter manner, it was the precipitate per se of the alchemists. -- White precipitate (Old Chem.) (a) A heavy white amorpho…

A pale green mineral occurring in crystalline aggregates having a botryoidal or mammillary structure, and rarely in distinct crystals. It is a hydrous silicate of alumina and lime.

Pertaining to, or designating, a tetrabasic acid of benzene obtained as a white crystalline substance; -- probably so called from the resemblance of the wartlike crystals to the mammillæ on the surface of prehnite.

A defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which producepresbytia.

mary rocks (Geol.), a term early used for rocks supposed to have been first formed, being crystalline and containing no organic remains, as granite, gneiss, etc.; -- called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of these the last two only are no…

all the inclosed spheres with their planets in a daily revolution from east to west. See Crystalline heavens, under Crystalline. The motions of the greatest persons in a government ought to be, as the motions of the planets, under primum mobile. Bacon.