gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1980.043.329.09 A New Synthesis and Characterization of Magnesium-Aluminium Hydroxides1 Mascolo G. Marino O. Istituto di Chimica Applicata, Facoltà d'Ingegneria dell'Universitá di Napoli, Italy 3 1980 43 329 619 621 5 4 1979 3 7 1979 Copyright © 1980, The Mineralogical Society 1980 Summary

A new synthesis of Mg-Al double hydroxides is described, that gives products relatively low (0.8–1.0%) in CO2. The general formula [Mg1−xAlx (OH)2][(OH)x(H2O)0.81−x] with 0.23 ≤ x ≤ 0.33 is proposed. Cell parameters and thermal data are given. The c-axial length decreases with Al-content; this is attributed to increased electrostatic attraction between layers.