There are so very many crystal related books on the market that it is difficult to narrow it down. I also strongly believe that books are often best used to identify the gemstone, mineral, or fossil in front of you. The books can be used to confirm what your intuition shares with you regarding the best use of the stone, however; your intuition and connection to each part of your toolkit is the best way to know how to use them.
That said, what follows is a list of what is currently on my bookshelf.
Cunningham’s Encyclopedia of Crystal, Gem & Mineral Magic https://amzn.to/3q8CQrp
The Crystal Bible Volume 1 https://amzn.to/3bQhee9
The Crystal Bible Volume 2 https://amzn.to/3rcta0g
The Crystal Bible Volume 3 https://amzn.to/2OeyX6M
3 Volume Set of the Crystal Bible https://amzn.to/3sEOKLk
The Crystal User’s Handbook https://amzn.to/3b8GKfH
Leslie J Franks
Stone Medicine: A Chinese Medical Guide to Healing with Gems and Minerals https://amzn.to/3sDuwkR
Crystal Grids How and Why They Work https://amzn.to/3e732A2
Sue and Simon Lilly
Healing with Crystals and Chakra Energies https://amzn.to/3dTyOka
Crystals and Crystal Healing https://amzn.to/2NVjetw
Your Crystal Code https://amzn.to/3b7VF9M
The Crystal Healer https://amzn.to/2OhhN8w