Figure 8

Diamonoids (diamond-like carbon) in temple sediment. (a) Transmission electron microscopy (TEM) image of clusters of amorphous diamonoids. (b) Bright-field high-resolution transmission electron microscopy (HRTEM) of acid-resistant residue showing the short-range ordering of carbon atoms. (c) Selected-area electron diffraction (SAD) of residue and grid film, confirming that the residue is amorphous carbon. (d) Photomicrograph of diamonoids showing white to clear material on black carbon SEM tab; (e) photomicrograph of the same area as in panel ‘d’ showing that the diamonoids luminesce at ~ 440 nm, typical of cubic diamonds.