Particular lines from the Chasm reports you can find for an achievement. From part 1 of the rep

Particular lines from the Chasm reports you can find for an achievement. 

From part 1 of the report: I haven’t really seen any violet-red soil, unless you count the clearly corrupted pulsing purple-red down in the underground mines. Is that… the Glazed Sand Crystal? It can’t be, right??

From part 2 of the report: Lumenstone ore actually expands outward, but it drains elemental energy when doing so. That sounds like… corrosion but light colored lol. Anyway, not a good thing, no matter how you look at it. 

From part 3 of the report: This is probably the same “crystal” that caused the Chasm to be sealed and that the Fatui went to investigate? God, the terminology is so vague and confusing… But here it’s noted to “grow” so it’s different stuff from the pillar? But it’s not Lumenstone and it probably isn’t Glazed Sand Crystal (since those have names and wouldn’t need to be referred to so vaguely), so I’m just really unclear what this is. Do we just not see it in game so far? 

They also discuss the “heavenly star” that fell in the Chasm. imo the star itself returned to the heavens, so it’s not down there. It did probably cause all this in some fashion. It seems like Lumenstone might be from the “chariot” since it glows like moonlight and all that, but I dunno about Glazed Sand Crystal.