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A sulphide of nickel, commonly occurring in delicate capillary crystals, also in incrustations of a bronze yellow; -- sometimes called hair pyrites.

A mineral occurring in pale yellow or brownish hexagonal crystals. It is an arseniate of lead.

Imitative; characterized by resemblance to other forms; -- applied to crystals which by twinning resemble simple forms of a higher grade of symmetry.

tance occurring in nature, having a definite chemical composition and usually a distinct crystalline form. Rocks, except certain glassy igneous forms, are either simple minerals or aggregates of minerals.

A crystalline or frosted appearance produced by some acids on tin plate; also, the tin plate thus treated.

The thick, brown or dark colored, viscid, uncrystallizable sirup which drains from sugar, in the process of manufacture; any thick, viscid, sweet sirup made from vegetable juice or sap, as of the sorghum or maple. See Treacle.

for forming underground drains. [U.S.] Duck mole. See under Duck. -- Golden mole. See Chrysochlore. -- Mole cricket (Zoöl.), an orthopterous insect of the genus Gryllotalpa, which excavates subterranean galleries, and throws up mounds of earth resembling those of the mole. It is said to do damage by injuring the roo…

A mineral occurring usually in small isolated crystals, -- phosphate of the cerium metals.

in solid cakes from South America and believed to be derived from the bark, of the tree Chrysophyllum glycyphloeum. It is used as an alterative and astringent.

Having one oblique intersection; -- said of that system of crystallization in which the vertical axis is inclined to one, but at right angles to the other, lateral axis. See Crystallization.

A yellow crystalline substance of acid properties extracted from fustic (Maclura tinctoria, formerly called Morus tinctoria); -- called also moric acid.

ty of tannic acid extracted from fustic (Maclura, formerly Morus, tinctoria) as a yellow crystalline substance; -- called also maclurin.

A bitter white crystalline alkaloid found in opium, possessing strong narcotic properties, and much used as an anodyne; -- called also morphia, and morphina.

Mosaic gold. (a) See Ormolu. -- (b) Stannic sulphide, SnS2, obtained as a yellow scaly crystalline powder, and used as a pigment in bronzing and gilding wood and metal work. It was called by the alchemists aurum musivum, or aurum mosaicum. Called also bronze powder. -- Mosaic work. See Mosaic, n.

e impure or complex residual solution which remains after the salts readily or regularly crystallizing have been removed. -- Mother queen, the mother of a reigning sovereign; a queen mother. -- Mother tongue. (a) A language from which another language has had its origin. (b) The language of one's native land; native…

ountain cork (Min.), a variety of asbestus, resembling cork in its texture. -- Mountain crystal. See under Crystal. -- Mountain damson (Bot.), a large tree of the genus Simaruba (S. amarga) growing in the West Indies, which affords a bitter tonic and astringent, sometimes used in medicine. -- Mountain dew, Scotch wh…

The acid amide of mucic acid, obtained as a white crystalline substance.

; specif., denoting an acid obtained by the oxidation of gums, dulcite, etc., as a white crystalline substance isomeric with saccharic acid.

ubstance obtained from murexide, alloxantin, and other ureids, as a white, or yellowish, crystalline which turns red on exposure to the air; -- called also uramil, dialuramide, and formerly purpuric acid.

A crystalline nitrogenous substance having a splendid dichroism, being green by reflected light and garnet-red by transmitted light. It was formerly used in dyeing calico, and was obtained in a large quantities from guano. Formerly called also ammonium purpurate.