Fig. 3

Plot of the wavenumber maxima of the bending (δmaxSi-O) and stretching (νmaxSi-O) bands of the Raman spectra of the beads classified according to morphological parameters. Colour fill represents the colour of the beads

Plot of the wavenumber maxima of the bending (δmaxSi-O) and stretching (νmaxSi-O) bands of the Raman spectra of the beads classified according to morphological parameters. Colour fill represents the colour of the beads