Blue banded agate, blue lace agate, Holley blue agate, and common agate found in hues of blue are all sought in magical work for their attributes of amplifying and clarifying communication. As agate crystals they of course carry many other benefits common to their mineral group, but more often than not when they turn up as a spell component it is for their value as communication enhancement crystals. They aid in mundane communication between two or more people, communication with animals (mundane or psychic), and all forms of psychic or mystical communication from empathy and telepathy to contact and discourse with spiritual beings during magical operations.