Lanthanum carbonate, La₂(CO₃)₃

Lanthanum carbonate, La₂(CO₃)₃.8H₂O, loses 7H₂O at 100°. The octahydrate occurs in nature as the orthorhombic mineral lanthanite (a:b:c = 0.9528:1:0.9023). The following double salts are known:

La₂(CO₃)₃. K₂CO₃.12H₂O, 2La₂(CO₃)₃.3Na₂CO₃.2OH₂O; La₂(CO₃)₃. (NH₄)₂CO₃.4H₂O