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2012 June
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Picture of the day
Chips of
cobalt
,
electrolytically refined
, as well as a
1 cm
3
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
.
Photo:
Alchemist-hp
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