Siberian Nephrite Jade, Calcium Magnesium Iron Silicate Hydroxide: Ca2(Mg,Fe)5Si8O22(OH)2 Mohs: 6-6.5 Source: The Sayan Mountains near Lake Baikal, in central Siberia. The name nephrite is derived from lapis nephritis, which in turn is derived from Greek λίθος νεφριτικός; νεφρός λίθος, which means 'kidney stone' and is the Latin and Greek version of the Spanish piedra de ijada (the origin of "jade" and "jadeite"). Accordingly, nephrite jade was once believed to be a cure for kidney stones. Famous for its use by Fabergé, he favored the dark-green Nephrite jade from Siberian sources over the lighter Jadeite. From about the earliest Chinese dynasties Jade was used for creating many utilitarian and ceremonial objects, ranging from indoor decorative items to jade burial suits. Jade was considered the "imperial gem". Nephrite Jade is often used in dream work, to help with lucid dreaming, and with remembering dreams. Nephrite Jade carries revitalizing energy that can help to speed healing. It is a stone of health and abundance, allowing Divine energy to enhance the circumstances of life. Used as a good-luck talisman, Nephrite Jade helps open the Heart Chakra to allow good fortune to flow naturally into one's experience of the physical realm. The "stone of fidelity", Jade is wonderful for working with the Heart Chakra, balancing male and female energies, and helping with dysfunctional relationships. Nephrite Jade can be used as a protective stone that transmutes negative energies into positive. Nephrite Jade can instill a sense of calm and well-being and can help to increase one's enjoyment of life. Nephrite Jade promotes confidence and calms the nervous system.