Crystal are essential components of many technologies. You'll probably be surprised to learn that crystals are powering devices that you use every single day. This list is full of uses for crystals. They are key components in machines which are necessary for our health and our modern communication methods.Then there are also the "new age" uses for crystals. The jury is still out on whether crystal healing works, but there are lots of people who swear by it. Take a look at this list and decide what you think.