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tly alkaline reaction, and is used in medicine as a mild antacid laxative. See Magnesium. Magnesia alba Etym: [L.] (Med. Chem.), a bulky white amorphous substance, consisting of a hydrous basic carbonate of magnesium, and used as a mild cathartic.

Pertaining to, characterized by, or containing, magnesia or magnesium. Magnesian limestone. (Min.) See Dolomite.

Any substance which absorbs and neutralizes acid fluid in the stomach and bowels, as magnesia, chalk, etc.; also a substance e. g., iodine) which acts on the absorbent vessels so as to reduce enlarged and indurated parts.

A kind of plastic cement, or artificial stone, consisting chiefly of magnesia and silica; -- called also albolite.

hese salts is mainly soda with a smaller amount of potash, and usually a little lime and magnesia. Two main classes of alkali are commonly distinguished: black alkali, which may be any alkaline carbonate, but which practically consists of sodium carbonate (sal soda), which is highly corrosive and destructive to vegeta…

perties of an alkali. Alkaline earths, certain substances, as lime, baryta, strontia, and magnesia, possessing some of the qualities of alkalies. -- Alkaline metals, potassium, sodium, cæsium, lithium, rubidium. -- Alkaline reaction, a reaction indicating alkalinity, as by the action on limits, turmeric, etc.…

Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica.

lant of the genus Cardamine, esp. C. amara. -- Bitter earth (Min.), tale earth; calcined magnesia. -- Bitter principles (Chem.), a class of substances, extracted from vegetable products, having strong bitter taste but with no sharply defined chemical characteristics. -- Bitter salt, Epsom salts;; magnesium sulphate.…

A common name of dolomite; -- so called because it contains magnesia, the soluble salts of which are bitter. See Dolomite.

n medicine. It is composed essentially of hydrous silicates of alumina, or more rarely of magnesia. See Clay, and Terra alba.

A variety of enstatite, often having a bronzelike luster. It is a silicate of magnesia and iron, of the pyroxene family.

An apple-green mineral, a hydrous arseniate of nickel, cobalt, and magnesia; -- so named from the Sierra Cabrera, Spain.

ug. -- Drawing chalk. See Crayon, n., 1. -- French chalk, steatite or soapstone, a soft magnesian mineral. -- Red chalk, an indurated clayey ocher containing iron, and used by painters and artificers; reddle.

and micaceous to granular in structure. They are hydrous silicates of alumina, iron, and magnesia. Chlorite slate, a schistose or slaty rock consisting of alumina, iron, and magnesia.

A fluosilicate of magnesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone.

A mineral, composed of silica, magnesia, and iron, of a yellow to green color. It is common in certain volcanic rocks; -- called also olivine and peridot. Sometimes used as a gem. The name was also early used for yellow varieties of tourmaline and topaz.

own and decomposition, in part, of rocks containing aluminous minerals, as granite. Lime, magnesia, oxide of iron, and other ingredients, are often present as impurities.

A magnesian variety of dolomite.

A supposed alkaloid obtained from croton oil by boiling it with water and magnesia, since found to be merely a magnesia soap of the oil. Watts.

A mineral consisting of the carbonate of lime and magnesia in varying proportions. It occurs in distinct crystals, and in extensive beds as a compact limestone, often crystalline granular, either white or clouded. It includes much of the common white marble. Also called bitter spar.