The very sky seemed pitiless in the intensity of its cobalt.
Very good, Cobalt—you'll 'phone me if you make any other discoveries.
"I wish you'd call me Cobalt, miss," said the man with a smile.
It is the source of a considerable supply of nickel and cobalt.
The ores have a high content of cobalt and also carry precious metals.
Cobalt is also used in some of the best ...