I will back up Lost Soul here Rocks aint just rocks.

Its all about resonance and being able to pick up on it, diffent minerals resonate at different frequencies causing different effects, and if you dont think resonance can effect you Acoustic, Infrasound. Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles. Transmission of long wavelength sound creates biophysical effects; nausea, loss of bowels, disorientation, vomiting, potential internal organ damage or death may occur. Superior to ultrasound because it is "in band" meaning that its does not lose its properties when it changes mediums such as from air to tissue. By 1972 an infrasound generator had been built in France which generated waves at 7 hertz. When activated it made the people in range sick for hours. Dolphins use can focus a blast of infrasound in a resonant shockwave to stun their prey too.

Crystals on the other hand work at very high frequencies they emit their own energy just laying around the lattice structure of the crystal stores and emits energy. Alone its at very low levels, but with the induction of outside energy sources, light, pressure, sound, electricity, heat, even biomagnetic energy they can be very usefull in Focusing, storing, reduction of noise in the original transmission lots of stuff dont beleive me? Thats how the RAM in your comuter works, using the lattice structure of Si (Silicon) and electricity. Most people think crystal storage devices are Si-Fi, not really, they are already being used =) Ibm is already working with quartz and finding it can stor vast amounts of info, but it needs to be refreshed with power constantly, lots of bugs still.

So whats this have to do with putting a not just rocks, a crystal next to your head? Well you emit energy in the form of heat, Biomagnetic energy a very small electrical signal and also those resonant brain waves.

Me being the proponent for light love crystals one can do some fun things with them and light.