Calcite can appear as a white, grey, black, green, brown, yellow, blue, or red stone. In short, just about any color. Should you happen to be in Egypt (or South America), calcite is said to benefit from a night in a pyramid. It is useful in assisting the cleansing organs (kidneys, pancreas, and spleen), bones, and joints. It also sharpens mental clarity. Green calcite is especially helpful in adjusting to transitions and so is greatly recommended for children, while calcite in general is considered good for balancing male/female energies and emotion. Calcite alleviates fears and anxieties and grounds excess energy. It is used by psychics to increase concentration and assist in astral projection. The color of the stones corresponds to the chakra with which it should be used.