Here you can find websites that offer information on the metaphysical properties/uses for crystals/stones. I once thought I would make such a list on my own, but, since others have done it so well, I see no need. I will just list the best I have found, or the ones I have found which answer specific questions.
The best overall listing I have seen is:
Robyn Harton: I found Robyn Harton because she was the Reiki teacher of one of my favorite Reiki friends of all time). Robyn’s work with crystals/stones is amazing, extensive, and very thorough. It is rare that I cannot find what I am looking for on her site.