I have a small individual where the texture of the fusion crust is completely different from any of the others in my (admittedly small) collection. On the rounded side, it is of typical smoothness, but on the flat side, it feels almost like fine sandpaper and appears almost porus. Is this more likely to be a post-fall erosion feature, or some sort of "bubbling"/"frothing" of the molten rock during ablation?
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