Example data comparing four different agate Raman analyses in the diagnostic region between 400 cm-1 to 550 cm-1 region showing the strongest peaks for quartz at 463 cm-1 and moganite at 501 cm-1.  These data were taken from narrow-band analysis (summing all spectra in the narrow agate bands that contained quartz + moganite).  Each band was used as a separate analysis.  Shown are the analyses of two different agates from Brazil (blues), and two different agates from from Germany (reds). Note the strong moganite presence in the Brazilian agates.