kobalt
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Cobalt silicate and cobalt(II) aluminate (CoAl2O4, cobalt blue) give a distinctive deep blue color to glass, smalt, ceramics, inks, paints and varnishes. (...)
"Cobalt (/ˈkoʊbɒlt/ or /ˈkoʊbɔːlt/)] is a chemical element with symbol Co and atomic number 27. [...] Miners had long used the name kobold ore (German for goblin ore) for some of the blue-pigment producing minerals [...]
Cobalt is used in the preparation of magnetic, wear-resistant and high-strength alloys. Cobalt occurs naturally as only one stable isotope, cobalt-59. Cobalt-60 is a commercially
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