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Chalcedony is part of the Quartz family with a structure called "cryptocrystalline." It is great for those who become nervous during public speaking, and allows you to ease your self-doubt. This is a very calming stone and can be helpful for those who tend to worry about the future or events that have not even occurred. If you struggle with self-expression, Chalcedony works with the Throat Chakra to allow true expression of emotions.