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(a) Image taken at the calcium LII,III edge of the mix of the orthorhombic C3A and gypsum sample at a ratio of 0.2; (b) magnification of area 1 in (a); (c) NEXAFS spectra of the line scans 3–7 indicated in (b); (d) image maps of calcium in the same area as (b), where the brighter areas are related to higher concentration of calcium; (e) RGB composite map of region 2 in Figure 8b; and (f) NEXAFS spectra of the red, green and blue regions observed in (e).
