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A basic lead carbonate-montmorillonitec omplexw as prepared by treating a natural montmorillonite hydrothermally for 120 h at 250°C with lead powder, dry ice and lead nitrate solution. The product is a non-swelling material showing well-outlined, hexagonal, thin plates <1 µm in size; the symmetry is pseudo-orthorhombic, a = 5·141(7) Å, b = 9·005(5) Å, c = 17·420(4) Å, and Z = 2. The X-ray powder pattern is characterized by a 17·4 Å reflection and an integral series to the 14th order. Thedoi:10.1180/claymin.1993.028.1.02 fatcat:lnz4t5kgx5a4rm46jj4kfg3hiy