Related Structures: Sodalite, Hackmanite, Linde Type A, Faujasite
Lazurite is a naturally occurring mineral with the sodalite structure type. It has been mined as the rock lapis lazuli for thousands of years from north eastern Afganistan and remains the primary source of the mineral today. The rock can be refined to form the prized pigment ultramarine. The intense blue hue is derived from the absorption spectrum of a trisulfur radical anion trapped within the sodalite cage. Under most conditions, the trisulfur radical anion is highly reactive and essentially unknown in a persistent and isolable state. To date, no known coordination compound is known to stabilize S3– though a number of theoretical structures have been proposed. The chemistry of the trisulfur radical anion, has recently been reviewed.