Co"balt(k"blt; 277, 74), 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.
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.
2. A commercial name of a crude arsenic used as fly poison.
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. --
(Min.) See Cobaltite. --
Cobalt green, a pigment consisting essentially of the oxides of cobalt and zinc; -- called also
Rinman's green. --
(Chem.), a yellow crystalline powder, regarded as a double nitrite of cobalt and potassium.
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Tue 18th December 2018