Lazurite – Stone of Heaven
Lazurite – Stone of Heaven Category – Tectosilicate Chemical Formula (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)] Crystal Symmetry – Cubic hexoctahedral Color – Deep Blue, azure, violet-blue, greenish blue Crystal Habit – Crystals occur as dodecahedra, or rarely cubes; granular, disseminated, or massive Crystal System isometric Cleavage – imperfect Fracture – uneven Tenacity – Brittle Mohs scale – 5-5.5 Luster – Vitreous Lazurite a member of the Sodalite group. It is usually massive and forms the bulk of the gemstone Lapis Lazuli. Lazurite is a deep blue to greenish blue. It commonly contains or is associated with grains of pyrite. Lazurite was first described in 1890 for an occurrence in the Sar-e-Sang District, Koksha Valley, Badakhshan Province, Afghanistan. It has been mined for over 6,000 years in the lapis lazuli district of Badakhshan, Afghanistan. It has been used as a pigment in painting and cloth dyeing since at least the sixth or seventh century AD. It is ...