Figure 4

Raman chemical image of a predominantly brushite kidney stone. The stone contains brushite (red), COM (cyan), COD (yellow), and apatite (magenta). (a) 10 µm spatial resolution map along the length of a brushite stone. (b) 1 µm spatial resolution map of solid inset. (c) 1 µm spatial resolution map of hydroxyapatite band (dashed inset). White light images are shown in Figure S10.