Anionic clay compounds such as hydrotalcite-like compounds can be made by
a process wherein a non-hydrotalcite-like compound (or a
hydrotalcite-like compound) are heat treated and then hydrated to form
hydrotalcite-like compounds having properties (e.g., increased hardness
and/or density) that differ from those of hydrotalcite-like compounds
made by prior art methods wherein non-hydrotalcite-like compounds (or
hydrotalcite-like compounds) are not similarly heat treated and hydrated
to form such hydrotalcite-like compounds.