The Collaborative International Dictionary
Cobalt \Co"balt\ (k[=o]"b[o^]lt; 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.]
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(Chem.) A tough, lustrous, reddish white metal of the iron group, not easily fusible, and somewhat magnetic. Atomic weight 59.1. Symbol Co.
Note: 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.
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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.
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.
Wiktionary
a. The color of the pigment zaffre. n. a deep blue pigment derived from cobalt; zaffre
WordNet
n. a shade of blue tinged with green [syn: greenish blue, aqua, aquamarine, turquoise, peacock blue]
greenish-blue pigment consisting essentially of cobalt oxide and alumina [syn: cobalt ultramarine]
Wikipedia
Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with alumina at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAlO. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue. It is extremely stable and has historically been used as a coloring agent in ceramics, (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment smalt.
Cobalt blue is a type of color. Additionally, it may refer to:
Usage examples of "cobalt blue".
Mountainous anvil-headed thunderclouds marched along the darkling western horizon to the sound of distant thunder, and the sinking sun costumed them with suits of rosy gold and glittering cobalt blue.
He felt as though he could drown in the cobalt blue irises, and feast on the full pink lips that tempted him like a starving man.
The deep water was dyed cobalt blue, becoming emerald as it shallowed, and then fading to aquamarine as its waves fanned out on the bleached sand.
He turned off his headlamp again, and the luminous cobalt blue of the glacial light glowed around him, dim and rich.
Outside the glary cone of his headlamp's beam, the ice was an intense cobalt blue, an effect caused by the same Rayleigh scattering that blued the color of the sky.
The women's elaborate robes glowed a deep cobalt blue even as the sunlight behind them lay as thick and red as blood on the interior adobe walls.
I can see his eyes, cobalt blue in a flash of lightning, and I know that he wants me the way no one else ever has, or ever will.
The oval dome itself was a cobalt blue, shining wetly in what he presumed to be the late-afternoon sun.