Figure 6From: Incorporation of Mg2+ in surface Ca2+ sites of aragonite: an ab initio study Side views of the relaxed aragonite {110} surface in which Mg 2+ substitutes for Ca 2+ . (a) No substitution, (b) substitution into the second Ca layer, and (c) substitution into the fourth Ca layer. Red, brown, blue, and orange circles represent O, C, Ca, and Mg, respectively.Back to article page