A: Water distribution map of an olivine grain from sample Ol1 measured with Fourier transform infrared (FTIR) spectroscopy coupled to a focal-plane-array (FPA) detector (pixel size is 5.6 × 5.6 µm). The border of the clear olivine is traced with a white line. Black pixels are associated with hydrous phases such as antigorite, whereas water-free oxides are represented by white pixels. B: Crystallographic axes determined from olivine overtones using polarized FTIR.