Fig. 1. X-ray diffraction curves of precipitated iron sulfides from the reactions between sulfide ions and three Fe sources in saline environments at different times. Goethite in NaCl solution (A). Ferrihydrite in NaCl solution (B). Ferrihydrite in artificial seawater (C). S = rhombic sulfur; P = pyrite, N = NaCl; peak labels are in nanometers.