I've never heard of Citrine for the Crown Chakra.. as far as I was aware its main use is for the Sacral Chakra. Oh well; I suppose different people find use in different things.
Great site on Crystal Healing: http://www.shimmerlings.com/jewelry_healing/index.htm
Fab site on Crystals for Chakras: http://www.shimmerlings.com/jewelry_chakras/chakras_introduction.htm
On the second link, just click on the chakra/s you are interested in, and at the side it should tell you most of the gemstones that work well with that particular chakra.
And Celeste, I think you may be thinking of something called Reiki. Reiki is otherwise known as 'palm healing.' This is where people pass ki through the palms, healing certain points on the body. I suggest you Google about on it. :)