Cobalt bloom. Same as Erythrite. -- Cobalt blue, a dark blue pigment consisting of some salt of cobalt, as the phosphate, ignited with alumina; -- called also cobalt ultramarine, and Thenard's blue. -- Cobalt crust, earthy arseniate of cobalt. -- Cobalt glance. (Min.) See Cobaltite. -- Cobalt green, a pigment consisting essentially of the oxides of cobalt and zinc; -- called also Rinman's green. -- Cobalt yellow (Chem.), a yellow crystalline powder, regarded as a double nitrite of cobalt and potassium.
Co*balt"ic (?; 74), a. [Cf. F. cobaltique.] (Chem.) Pertaining to, derived from, or containing, cobalt; -- said especially of those compounds in which cobalt has higher valence; as, cobaltic oxide.
Luteo-cobaltic compounds (Chem.), an extensive series of complex yellow compounds of ammonia and cobaltic salts. -- Roseo-cobaltic compounds (Chem.), an extensive series of complex red compounds of cobalt and ammonia. Modifications of these are the purpureo-cobaltic compounds.
Co`balt*if"er*ous (?), a. [Cobalt + -ferous.] (Min.) Containing cobalt.
{ Co"balt*ine (?), Co"balt*ite (?) } n. (Min.) A mineral of a nearly silver-white color, composed of arsenic, sulphur, and cobalt.
Co*balt"ous (?), a. (Chem.) Pertaining to, derived from, or containing, cobalt; -- said esp. of cobalt compounds in which the metal has its lower valence.
Cobaltous chloride, a crystalline compound, CoCl2, of a pale rose color when hydrous, blue when dehydrated. Its solution is used for a sympathetic ink, the writing being nearly colorless when dried in the air, owing to absorbed moisture, and becoming bright blue when warmed.
Cob"bing (?), a. Haughty; purse-proud. See Cob, n., 2. [Obs.] Withals (1608).
Cob"ble (?), n. A fishing boat. See Coble.
Cob"ble, n. [From Cob a lump. See Cob, n., 9, and cf. Copple, Copplestone.] 1. A cobblestone. "Their slings held cobbles round." Fairfax.