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.
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.