The white selenite generator is a fantastic tool for crystal healing and spiritual practice, using the natural qualities of selenite crystal to aid in capturing and directing positive energy. Selenite generators can be used during meditation or they can be placed on your desk, coffee table, alter, etc to keep an area cleansed and high in positive energy. Self Cleansing. Feel free to dust or wipe with dry cloth. Do not Wet. They vary a bit in size but are approximately 3 3/4″ long & around 1 1/4″ wide.