Fig. 4
From: Phosphogypsum waste as additives to lime stabilization of bentonite
SEM images of raw bentonite and the main mixture. a, b, c: morphology of well crystalized smectite. d: CSH and strätlingite occurrence. e: CSH draping smectite. f: Smectite associated with non-altered feldspar. g, h: Abundant CSH gel covering the altered smectite. i: altered feldspar and poorly crystalline smectite. Sm: Smectite; F: Feldspar; CSH: Calcium Silicate Hydrate. St: Strätlingite