Cobalt

1. (Chem.) A tough, lustrous, reddish white metal of the iron group, not easily fusible, and somewhat magnetic. Atomic weight 59.1. Symbol Co.
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.
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.