Cerulean

Cerulean, also called chessy or azure, is burbled dark blue stone. It has magical properties aligned with water unless it is ground up, as it often is for use as a pigment. It is second to cinnabar as a dweomer pigment.
==Sources==
http://www.wikiwand.com/en/Azurite
http://www.wikiwand.com/en/Cerulean
Category:Minor Stones
Category:Water
Category:Blue Gemstones