Cobalt () is a hard, lustrous, grey
metal, a
chemical element with symbol
Co. Although cobalt-based colors and pigments have been used since ancient times, and miners used the name
kobold ore for some minerals, cobalt was only discovered in 1735 by
Georg Brandt. It is found in various metallic-lustred
ores for example
cobaltite (CoAsS), but it is produced as a by-product of
copper and
nickel mining. The copper belt in the
Democratic Republic of the Congo and
Zambia yields most of the worldwide mined cobalt. Cobalt is used in the preparation of
magnetic, wear-resistant, and high-strength
alloys.
Cobalt blue (cobalt(II) aluminate, CoAl
2O
4) gives a distinctive deep blue color to
glass,
ceramics,
inks,
paints, and
varnishes.
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