Communication Crystals are magical crystals that allow two individuals to communicate telepathically when both are holding one. They are described as the magical counterpart of telephones and are used by the staff of Magic School.


While helping Billie Jenkins go on a Vision Quest to deal with her conflicts, Arthur Cobbs was contacted through a crystal to inform him that his appointment had been moved up.

When going on his expedition Professor Whitney left a crystal with Leo Wyatt so he could be reached in case of emergency. However, when Leo attempted to contact him, he couldn't reach him.

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