Template:POTD/2012-06-29
{{POTD {{{1|{{{style|default}}}}}}
|image=Kobalt electrolytic and 1cm3 cube.jpg
|title=Cobalt
|texttitle=Cobalt
|caption=Chips of cobalt, electrolytically refined, as well as a {{nowrap|1 cm3}} cube for comparison. Cobalt is a hard, lustrous, silver-gray metal that is found naturally only in chemically combined form. Cobalt-based blue pigments have been used since ancient times for jewelry and paints, as well as blue-colored glass.
|credit=Photo: Alchemist-hp