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Lead monoxide; a yellowish red substance, obtained as an amorphous powder, or crystallized in fine scales, by heating lead moderately in a current of air or by calcining lead nitrate or carbonate. It is used in making flint glass, in glazing earthenware, in making red lead minium, etc. Called also massicot.…

The oxide of lithium; a strong alkaline caustic similar to potash and soda, but weaker. See Lithium. Lithia emerald. See Hiddenite.

r women's dresses. Luster ware, earthenware decorated by applying to the glazing metallic oxides, which acquire brilliancy in the process of baking.

A light earthy white substance, consisting of magnesium oxide, and obtained by heating magnesium hydrate or carbonate, or by burning magnesium. It has a slightly 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…

Pertaining to, or containing, magnesium; as, magnesic oxide.

d ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, a…

An oxide of iron (Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. Called also magnetic iron.

ut rotates the plane of polarized light further to the right and possesses a lower cupric oxide reducing power.

An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty, but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic weight 54.8.

One of the oxides of manganese; -- called also gray manganese ore. It occurs in brilliant steel-gray or iron-black crystals, also massive.

hich the element has a lower valence as contrasted with manganic compounds; as, manganous oxide. Manganous acid, a hypothetical compound analogous to sulphurous acid, and forming the so-called manganites.

Iron sesquioxide in isometric form, probably a pseudomorph after magnetite.

Lead protoxide, PbO, obtained as a yellow amorphous powder, the fused and crystalline form of which is called litharge; lead ocher. It is used as a pigment.

An earthy black oxide of copper, arising from the decomposition of other ores.

An iron-black or steel-gray mineral, consisting chiefly of the oxides of iron and titanium. It is commonly massive, but occurs also in rhombohedral crystals. Called also titanic iron ore, and ilmenite.

Offensive to the smell; as, mephitic odors. Mephitic air (Chem.), carbon dioxide; -- so called because of its deadly suffocating power. See Carbonic acid, under Carbonic.

A hypothetical radical formerly supposed to exist in mesityl oxide. Mesityl oxide (Chem.), a volatile liquid having the odor of peppermint, obtained by certain dehydrating agents from acetone; -- formerly called also dumasin.

An elementary substance, as sodium, calcium, or copper, whose oxide or hydroxide has basic rather than acid properties, as contrasted with the nonmetals, or metalloids. No sharp line can be drawn between the metals and nonmetals, and certain elements partake of both acid and basic qualities, as chromium, manganese, bis…

metallic compound; specifically, the prismatic tints produced by depositing a film of peroxide of lead on polished steel by electricity.

ether CH3.O.CH3, obtained by the etherification of methyl alcohol; -- called also methyl oxide. -- Methyl green. (Chem.) See under Green, n. -- Methyl orange. (Chem.) See Helianthin. -- Methyl violet (Chem.), an artificial dye, consisting of certain methyl halogen derivatives of rosaniline.