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A colorless, crystalline, aromatic hydrocarbon, C6H2(CH3)4, off artificial production, with an odor like camphor.

A colorless, crystalline, nitrogenous base, obtained by the decomposition of cocaine.

A grayish white zeolitic mineral, in tetragonal crystals. It is a hydrous silicate of alumina and baryta.

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.

A compound or twin crystal made up of eight individuals.

ena of double refraction and their relation to the elastic force of the luminous ether in crystalline media.

merly Motordica Elaterium) and other related species. It is extracted as a bitter, white, crystalline substance, which is a violent purgative.

transparent, colorless oil obtained from elemi resin by distillation with water; also, a crystallizable extract from the resin.

or derived from, gallnuts or gallic acid; as, ellagic acid. Ellagic acid (Chem.), a white crystalline substance, C14H8O9, found in bezoar stones, and obtained by the oxidation of gallic acid.

niate of copper; green bice; Scheele's green; -- also used adjectively; as, emerald green crystals. -- Emerald Isle, a name given to Ireland on account of the brightness of its verdure. -- Emerald spodumene, or Lithia emerald. (Min.) See Hiddenite. -- Emerald nickel. (Min.) See Zaratite.

A white crystalline bitter alkaloid extracted from ipecacuanha root, and regarded as its peculiar emetic principle.

An orange-red crystalline substance, C15H10O5, obtained from the buckthorn, rhubarb, etc., and regarded as a derivative of anthraquinone; -- so called from a species of rhubarb (Rheum emodei).

ted to each other as a right-handed to a left-handed glove; -- said of certain hemihedral crystals.

An iron-black mineral of metallic luster, occurring in small orthorhombic crystals, also massive. It contains sulphur, arsenic, copper, and often silver.

A crystal of one species inclosed within one of another, as one of rutile inclosed in quartz.

Having water within; containing fluid drops; -- said of certain crystals.

A mineral of the pyroxene group, orthorhombic in crystallization; often fibrous and massive; color grayish white or greenish. It is a silicate of magnesia with some iron. Bronzite is a ferriferous variety.

llowish green (pistachio) color, occurring granular, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese.

Foreign; unnatural; unusual; -- said of forms of crystals not natural to the substances in which they are found.

A crystallized, transparent mineral of the Zeolite family. It is a hydrous silicate of alumina and lime.