Charging a stone with malevolence is an ancient Celtic method of delivering a curse.
Charge the stone by holding it in your hands while allowing yourself to be engulfed by feelings of rage, jealousy, anger, or hatred. The stone will store your this emotion. When charging is complete, terminate the process by setting the stone down and consciously changing your train of thought. Reserve the stone for future use.
Should one wish to curse someone or something, hold the stone within your hands, stroking it, while turning it counter-clockwise and murmuring curses.
Source: The Encyclopedia of 5,000 Spells by Judika Illes Read more about this idea here.
