Baotite Ba₄Ti₄(Ti, Nb, Fe)₄(Si₄O₁₂)O₁₆Cl is a rare mineral recognized as having a unique four-fold silicate ring. Crystals are tetragonal, though commonly deformed to the extent of appearing monoclinic. Named for the locality of first discovery, Baotou, China, baotite has been found in hydrothermal veins and alkalic rocks in various locations around the world.