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Pertaining to, or derived from, the mineral mellite. Mellitic acid (Chem.), a white, crystalline, organic substance, C6(CO2H)6, occurring naturally in combination with aluminium in the mineral mellite, and produced artificially by the oxidation of coal, graphite, etc., and hence called also graphitic acid.…

the oxides of iron and titanium. It is commonly massive, but occurs also in rhombohedral crystals. Called also titanic iron ore, and ilmenite.

ulus indicus (the fruit of Anamirta Cocculus, formerly Menispermum Cocculus) as a white, crystalline, tasteless powder; -- called also menispermina.

A white, crystalline, aromatic substance resembling camphor, extracted from oil of peppermint (Mentha); -- called also mint camphor or peppermint camphor.

A crystalline substance obtained from mesitylene.

A zeolitic mineral, grayish white or yellowish, occuring in delicate groups of crystals, also fibrous massive. It is a hydrous silicate of alumina, lime, and soda.

A polymeric modification of acrolein obtained by heating it with caustic potash. It is a crystalline substance having an aromatic odor.

A white crystalline substance isomeric with, and obtained from, acetic aldehyde by polymerization, and reconvertible into the same.

rocks may have undergone since their original deposition; -- especially applied to the recrystallization which sedimentary rocks have undergone through the influence of heat and pressure, after which they are called metamorphic rocks.

ng metamorphic; the process by which the material of rock masses has been more or less recrystallized by heat, pressure, etc., as in the change of sedimentary limestone to marble. Murchison.

uction in which an embryo undergoes a series of marked changes of external form, as the chrysalis stage, pupa stage, etc., in insects. In these intermediate stages sexual reproduction is usually impossible, but they ultimately pass into final and sexually developed forms, from the union of which organisms are produced…

sic acid, HPO3, analogous to nitric acid, and, by heating phosphoric acid, obtained as a crystalline substance, commonly called glacial phosphoric acid.

tion in a mineral or rock mass when involving a chemical change of the substance, as of chrysolite to serpentine; -- opposed to ordinary metamorphism, as implying simply a recrystallization. -- Met`a*so*mat"ic, a.

A stable crystalline compound obtained by the decomposition of hemoglobin. It is found in old blood stains.

esignating, a sulphonic (thionic) acid derivative of methane, obtained as a stable white crystalline substance, CH2.(SO3H)2, which forms well defined salts.

A white, silky, crystalline substance extracted from the thick rootstock of a species of pepper (Piper methysticum) of the South Sea Islands; -- called also kanakin.

Of or pertaining to the microcosm. Microcosmic salt (Chem.), a white crystalline substance obtained by mixing solutions of sodium phosphate and ammonium phosphate, and also called hydric-sodic- ammonic-phosphate. It is a powerful flux, and is used as a substitute for borax as a blowpipe reagent in testing for the metal…

luster and high specific gravity. It is a tantalate of calcium, and occurs in octahedral crystals usually very minute.

le image micrometer, in which the two images are formed by the double refraction of rock crystal. -- Filar, or Bifilar, micrometer. See under Bifilar. -- Micrometer caliper or gauge (Mech.), a caliper or gauge with a micrometer screw, for measuring dimensions with great accuracy. -- Micrometer head, the head of a mi…

mineral, under Agaric. -- Sugar of milk. The sugar characteristic of milk; a hard white crystalline slightly sweet substance obtained by evaporation of the whey of milk. It is used in pellets and powder as a vehicle for homeopathic medicines, and as an article of diet. See Lactose.