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Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals. Adherents of the practice claim that these have healing powers, but there is no scientific basis for this claim.[1][2][3] Practitioners of crystal healing believe they can boost low energy, prevent bad energy, release blocked energy, and transform a body's aura.[4] There is no evidence that crystal healing has any greater effect upon the body than any other placebo.
While the practice is popular, it fosters commercial demand for crystals, which can result in environmental damage and exploitative child labor to mine the crystals.[5] Several popular crystals used by believers such as shungite frequently contain heavy metals and present toxicity risks to those handling them for extended periods or ingesting substances which were in contact with the crystals.[6]