The very sky seemed pitiless in the intensity of its cobalt.
"I wish you'd call me Cobalt, miss," said the man with a smile.
Very good, Cobalt—you'll 'phone me if you make any other discoveries.
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 ...