Crystal healing is a pseudoscientific alternative medicine technique that uses semiprecious stones and crystals such as quartz, amethyst or opals. Adherents of the technique claim that these have healing powers, although there is no scientific basis for this claim. In one method, the practitioner places crystals on different parts of the body, often corresponding to chakras; or else the practitioner places crystals around the body in an attempt to construct an energy grid, which is purported to surround the client with healing energy. Despite this, scientific investigations have not validated claims that these "energy grids" actually exist, nor is there any evidence that crystal healing has any greater effect upon the body than any other placebo; for these reasons it is a pseudoscience.
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