Bismuth, cobalt, arsenic and nickel, 1869.

Native bismuth, Cornwall; red sulphide of arsenic (realgar), Transylvania, Romania; yellow sulphide of arsenic (orpiment), Hungary; arseniate of cobalt (cobalt-bloom), Saxony, Germany; hydrous carbonate of nickel (emerald-nickel), Pennsylvania. Illustration from 'Underground life, or, Mines and miners' by Louis Simonin (1830-1886), published in London in 1869.