There's so much to crystal magick that it's best to just read up on it. A good website to check out is www.healingcrystals.com. Also you kind of have to learn on your own because you have to feel them in order to see which ones will work best for you.
By: Misanthropy Moderator / Knowledgeable Nov 27, 2016
Post # 4
There is a really nice article on the topic here on the site as well. If you do a quick google search, you'll also find a lot of good info. I added the link below, just copy and paste it into your browser bar and remove any spaces that appear; then it should work just fine.
There are also some fantastic resource books out there for referencing a whole host of crystals and what they do. 'The crystal bible' is a very popular one. It can be found online and in most metaphysical/magic shops. it even comes in two different versions; a compressed 'pocket' book that is about five inches square, and a full-sized tome that has a wider selection of crystals, larger pictures, and a smidgeon more detail.