An exclusive offer is here for Black Agate Wiccan Set. Black Agate, like all black stones, is a grounding and protective crystal. It gives a calming peace that helps those during a period of bereavement. Black Agate gives inner strength to move on and is also very helpful in keeping the peace in stressful households. Despite variation within the Wiccan community, most believers share a general set of beliefs and practices. They believe in the Goddess, respect nature, and hold both polytheistic and pantheistic views.