| Cobalt | n. [ G. kobalt, prob. fr. kobold, kobel, goblin, MHG. kobolt; perh. akin to G. koben pigsty, hut, AS. cofa room, cofgodas household gods, Icel. kofi hut. If so, the ending -old stands for older -walt, -wald, being the same as -ald in E. herald and the word would mean ruler or governor in a house, house spirit, the metal being so called by miners, because it was poisonous and troublesome. Cf. Kobold, Cove, Goblin. ] 1. (Chem.) A tough, lustrous, reddish white metal of the iron group, not easily fusible, and somewhat magnetic. Atomic weight 59.1. Symbol Co. [ 1913 Webster ] ☞ It occurs in nature in combination with arsenic, sulphur, and oxygen, and is obtained from its ores, smaltite, cobaltite, asbolite, etc. Its oxide colors glass or any flux, as borax, a fine blue, and is used in the manufacture of smalt. It is frequently associated with nickel, and both are characteristic ingredients of meteoric iron. [ 1913 Webster ] 2. A commercial name of a crude arsenic used as fly poison. [ 1913 Webster ]
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. [ 1913 Webster ]
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| Cobaltic | 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. [ 1913 Webster ]
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. [ 1913 Webster ]
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| Cobaltous | a. (Chem.) Pertaining to, derived from, or containing, cobalt; -- said esp. of cobalt compounds in which the metal has its lower valence. [ 1913 Webster ]
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. [ 1913 Webster ]
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