Extended Data Fig. 2: X-ray diffraction (XRD) spectrum of the inclusions in the diamond clouds.
From: Redox state of the deep upper mantle recorded by nickel-rich diamond inclusions
a. ON-VRS-664 shows three major lines that fit those of δ-N2 and yield a volume of 26.37 ± 4 Å3 corresponding to pressure of 8.1 GPa at room temperature. Other peaks and shoulders fit CO2 under pressure of 8 GPa and gaspeite. Because of the difference in composition between the trapped and the reference gaspeite, no pressure could be estimated based on that phase. See Supplementary Data 2, Supplementary Fig. 2.3 for the full spectrum. b. X-ray diffraction of the high Ni concentration zone in the inclusions cloud of diamond ON-VRS-866. The lines are fitted by diffractograms of deltanitrogen (δ-N2, main phase), taenite (metallic, Ni-rich phase), and possibly Ni11N2 (or (Ni,Fe)11N2), an ordered supercell of fcc-type Ni with some sites unoccupied and some sites occupied by nitrogen.
