Co·balt n.
 1. 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.
 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.

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 E·ryth·rite n.
 1. Chem. A colorless crystalline substance, C4H6.(OH)4, of a sweet, cooling taste, extracted from certain lichens, and obtained by the decomposition of erythrin; -- called also erythrol, erythroglucin, erythromannite, pseudorcin, cobalt bloom, and under the name phycite obtained from the alga Protococcus vulgaris. It is a tetrabasic alcohol, corresponding to glycol and glycerin.
 2. Min. A rose-red mineral, crystallized and earthy, a hydrous arseniate of cobalt, known also as cobalt bloom; -- called also erythrin or erythrine.

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 cobalt bloom
      n : a reddish mineral consisting of hydrated cobalt arsenate in
          monoclinic crystalline form and used in coloring glass;
          usually found in veins bearing cobalt and arsenic [syn: erythrite]