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Diamond etching in high-temperature ambient-pressure experiments has been performed aimed to assess possible postimpact effects on diamonds in impact craters, for the case of the Popigai crater in Yakutia (Russia). The experiments with different etchants, including various combinations of silicate melts, air, and inert gases, demonstrated the diver...
Contexts in source publication
Context 1
... etched detrital diamonds have pitted or matted (honeycomb) surfaces, rounded edges and corners, and striation in the place of twinning sutures and cracks inherited from graphite crystals. The surface sculptures consisting of numerous intricately shaped steep-walled voids and round or hexagonal pits in the Popigai impact diamonds (Figure 1) are common to other diamonds of this origin. Resorption often produces irregular lacework-looking grains [17,18,[25][26][27][28]. ...
Context 2
... diamonds most often show pitted-honeycomb surfaces with hexagonal to nearly rounded etching pits [17,18,25,28,29,65]. Numerous pits of similar sizes (as in Figure 1) are the result of a very fast etching perpendicular to the surface known as a "normal type of etching" [66]. Therefore, the oxidation of diamonds in a cooling impact melt was a quite rapid event that caused a small effect only. ...
