Dear Colleagues, The deadline for the special issue “Significance of Ion-Adsorption (IA) Type Clay Deposits as Potential Sources of Lanthanides (REE)+Y+Sc” has been extended to May 31,2022. The manuscripts will be submitted online via Clay Minerals website at http://www.edmgr.com/clayminerals/. Please indicate the working title “Clays and REE” so that your manuscript will consider it for this special issue of Clay Minerals. Best regards. Prof. Dr. Asuman Günal Türkmenoğlu Special Issue Guest Editor