I've read that the colors of certain stones are associated with each chakra. You can place stones over each chakra point and use them to help you open and balance your chakras.
It is also a common belief that crystals and gems vibrate with their own, natural energies. They are believed to be able to store it, channel it, and balance it.It's possible that you were feeling something similar to that. Though, I've not heard of them ever shocking anyone.
I have added a few links below that you might find helpful. They over a bit more information on crystals and their uses in magic.