I live in the badlands. The word bentonite is oft-spoke. The clay is generated by the alteration of volcanic ash. The coulees I love are filled with it. The steep walls become slippery and dangerous to climb after a rain. Many a time have I slid down a hill, covered in the slimy mud. Until I became really ill, bentonite was just some “dirt” and an annoying aspect of the hills to be avoided after snowmelt or rainstorm. Now I eat the stuff (not straight from the coulee mind you).