Lazurite: (Na,Ca)8 (AlSiO4)6 (S,SO4,Cl)1-2
Main component of Lapis Lazuli. Lapis lazuli is one of the stones with the longest tradition of being considered a gem, with a history stretching back to 5000 BC. Deep blue in color and opaque, this gemstone was highly prized by the pharaohs of ancient Egypt, as can be seen by its prominent use in many of the treasures recovered from pharaonic tombs. It is still extremely popular today.
