Fig. 2. X-ray diffraction patterns of the silt fraction of mangrove soils from Pai Matos Island (PM), Caranguejo Island (IGUA), Itapanhaú River (ITA), Escuro River (RE), and Fazenda River (RF) at depths of 0 to 20 and 60 to 80 cm; M = mica, K = kaolinite, Fd = feldspar, Gb = gibbsite, An = anatase, Q = quartz, Gt = goethite, V = vermiculite.