cobalt blue

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A blue to green pigment consisting of a variable mixture of cobalt oxide and alumina.
• noun A moderate to deep vivid blue or greenish blue.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a deep blue pigment derived from cobalt; zaffre
• adjective The color of the pigment zaffre.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun greenish-blue pigment consisting essentially of cobalt oxide and alumina
• noun a shade of blue tinged with green