A light, relatively hard yet fragile mineral, sodalite is named after its sodium content; in mineralogy it may be classed as a feldspathoid. Well known for its blue color, sodalite may also be grey, yellow, green, or pink and is often mottled with white veins or patches. Practitioners have used sodalite to organize the mind, as it's said to promote rational thought, objectivity and perception. It is sometimes thought to cleanse lymph nodes and boost the immune system. This Hexagonal shaped piece of Sodalite measures 3cm x 3cm approx and is suspended from a 19 inch 925 Silver chain. While not an official birthstone, sodalite has been associated with the month of November. It depends who you ask, however, as Leavy notes that zodiac-wise, it's also associated with Virgo and Libra (which are not November signs).