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A comparatively rare element occurring most abundantly in the mineral chromite. Atomic weight 52.5. Symbol Cr. When isolated it is a hard, brittle, grayish white metal, fusible with difficulty. Its chief commercial importance is for its compounds, as potassium chromate, lead chromate, etc., which are brilliantly colore…

ny steel containing a notable quantity of some other metal alloyed with the iron, usually chromium, nickel, manganese, tungsten, or vanadium.

stinguished by its deep color, which is probably due to the presence of a little oxide of chromium.

c picture taken upon paper made sensitive with potassium bichromate or some other salt of chromium.

Same as Chromium. Chrome alum (Chem.), a dark violet substance, (SO4)3Cr2.K2SO4.24H2O, analogous to, and crystallizing like, common alum. It is regarded as a double sulphate of chromium and potassium. -- Chrome green (a) The green oxide of chromium, Cr2O3, used in enamel painting, and glass staining. (b) A pigment mad…

Same as Chromium steel, under Steel.

Pertaining to, or obtained from, chromium; -- said of the compounds of chromium in which it has its higher valence. Chromic acid, an acid, H2CrO4, analogous to sulphuric acid, not readily obtained in the free state, but forming well known salts, many of which are colored pigments, as chrome yellow, chrome red, etc. --…

A black submetallic mineral consisting of oxide of chromium and iron; -- called also chromic iron.

Of, pertaining to, or derived from, chromium, when this element has a valence lower than that in chromic compounds. Chromous acid, a bluish gray powder, CrO.OH, of weak acid properties and regard as an acid.

A sulphide of chromium observed in some meteoric irons.

ed by the French artist, Adrian Gusgnet, and consisting essentially of a basic hydrate of chromium. -- Methyl green (Chem.), an artificial rosaniline dyestuff, obtained as a green substance having a brilliant yellow luster; -- called also light-green. -- Mineral green. See under Mineral. -- Mountain green. See Green…

ed by Krupp, the details of which are secret. It is understood to involve the addition of chromium as well as nickel to the metal, and to include a treatment like that of the Harvey process with unknown variations or additions. The product is mentioned by some authors, as improved Harvey, or Harvey-Krupp armor plate.…

sisting largely of chrysolite, with pyroxene and picotite (a variety of spinel containing chromium).

gnet. -- Magnetic elements. (a) (Chem. Physics) Those elements, as iron, nickel, cobalt, chromium, manganese, etc., which are capable or becoming magnetic. (b) (Physics) In respect to terrestrial magnetism, the declination, inclination, and intensity. (c) See under Element. -- Magnetic equator, the line around the eq…

e metals and nonmetals, and certain elements partake of both acid and basic qualities, as chromium, manganese, bismuth, etc.

A pigment of a green color, the chief constituent of which is oxide of chromium.

A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal. Symbol Mo. Atomic weight 95.9.

Pertaining to, or designating, a certain one of the highly oxidized compounds of chromium, which has a deep blue color, and is produced by the action of hydrogen peroxide.

any one of several acids (known only in their salts) which contain more than one atom of chromium.

btained at the highest available laboratory temperatures (Lockyer); as protocalcium, protochromium, protocopper, protonickel, protosilicon, protostrontium, prototitanium, protovanadium. -- Pro`to*me*tal"ic (#), a.