Figure 5
X-ray fluorescence images and spectra of the piemontite-quartz schist at an excitation energy of (a) 7.132 keV (20 eV above the absorption edge of Fe), (b) 6.557 keV (20 eV above the absorption edge of Mn), (c) 6.517 keV (20 eV below the absorption edge of Mn). X-ray fluorescence images and their spectra, which were obtained by subtracting the data taken above and below the absorption edges of (d) the Fe K-edge (7.112 keV) and (e) the Mn K-edge (6.537 keV). (f) A visible-light image of the piemontite-quartz schist. |