http://en.wikipedia.org/wiki/Crystal
CHECK OUT AND READ UP ON HOW CRYSTALS CAN HEAL...OR HELP WITH ALL SORTS OF AILMENTS.
I HAVE SOLD CRYSTALS FOR MANY YEARS AND HAD LOTS OF PEOPLE RETURN WITH POSITIVE ATTITUDES TO THEM DUE TO THE HEALING THEY FELT FROM THE CRYSTAL. THIS IS WHY SOME MEDIUMS USE THE 'CRYSTAL BALL' TO COMMUNICATE, AS IT HAS 'ENERGIES' AND THE POWER TO EXUDE THEM TO THE PERSON USING IT.