K-bentonite  search
UFpotash bentonite
 potassium bentonite
RTclay minerals
 volcanic ash
 montmorillonite
 bentonite
 metabentonite
 illite
 smectite
 metasedimentary rocks
SNUsed as the clay mineral or metabentonite, a mineral or metasedimentary rock. A rock or mineral. Also index (bentonite AND/OR metabentonite; AND metasedimentary rocks) OR clay minerals as applicable.