Cunningham's Encycopedia is a fine reference.
It is a little rudimentary to be properly called encycopedic. Be that as it may, I can still recommend you give
it a lttle shelf space if you are drawn to using crystals and semiprecious gems in your spellwork. Keep an eye
out for other titles to use in concert, such as...
Ms. Hall has considerable experience with the majickal and
healing properties of crystals and has been able to create a lovely reference for your introduction to this work. She
has included a section of 'manuals' indicating ways to use the crystals in healing work, as well as meditations
for most all the individual stones. Again, perhaps not the be-all-end-all of resources for crystal majick; yet
I have found myself referring to it regularly for the stones I do not know intimately.
Keep in mind that many of the titles in Wicca 101 devote some pages to working with crystals!
