Perform the following ritual on a night of the full moon to cleanse a crystal of
negative influences and to charge it with healing power.
Begin by lighting two white altar candles ( one on each side of the altar). Place a small bowl or cup of fresh rainwater (or melted snow) and a dish of sand, soil or salt on the altar. In the center of the altar, place a censer containing any of the following incenses: frankincense, myrrh, nutmeg, patchouli, rose, saffron or sandalwood.
Take the crystal in your right hand and pass it through the smoke of the incense as you say:
By the power of the Goddess
Gently place the crystal in the dish of sand, soil or salt, and say:
By the power of the Horned God
Sprinkle a few drops of water on the crystal, and say:
By the power of the universe
Once again, take the crystal in your right hand. Move it in a sunwise circle around the flame of each candle as you say:
By the power of love
After the consecration ritual has been performed, cup the crystal between your hands and allow it to harmonise with your aura and spiritual consciousness. Breathe gently upon the crystal as you direct your thoughts and intentions into it. The charged crystal will respond to the energy of your will.
Information taken from: Fire Rose's World Of Wicca And Witchcraft