I know some people who swear by crystals, although I prefer to laugh at the little rocks. I’ll give you what little I have bothered to retain about their uses so far:
Activation/personalization: it’s not enough that you get charged for buying the world’s most common mineral at an inflated price of 1000% (Cecil’s info), but once you have a stone in your hands, you have to prepare it, or activate it. Depending on what crystal you bought, you have to wash it a certain way, let it dry a certain way, carry it around on your skin a certain number of days (presumably the crystal wil be infused with your body heat, aura, whatnot), lay it on a windowsill a certain number of days, expose it to the sun a certain number of days, and so on. Once the crystal is “prepared” it stops being a common piece of mineral and becomes a magical mystical rock with all sorts of powers.
What you do with them: Supposedly there are crystals for almost every single use you can think of. If you have high blood pressure, you can get crystals to help you. If you have loud hyperactive kids, Crystals will be there for you. If you suffer from AIDS, there are crystals to help you. It’s pathetic. More generic crystals can be carried around to purify your body and your aura, or a number of them can be placed in strategic locations to purify a room, remove bad energy, and so forth. I am sure there are even toilet crystals that act as air fresheners by purifying the air. If there aren’t there definitely should be, because this is the sort of thing that new age noodleheads are going to love.
Each stone has different properties. generally you use them by carrying them around on a necklace or something like that. many crystals are actually very pretty, it’s a shame that they have to be marketed in the ignorant way that they are. I’d much rather go out and buy a crystal because it looks good than have some advocate of witchcraft try to sell me a common mineral for its nonexistent powers.