Dictionary.net

• A residue of nickel, arsenic, &c., found in crucibles in which cobalt glass has been melted.

1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.

• An impure arsenide of nickel, obtained from the ores of cobalt and nickel in smalt-works.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.