![](https://ffxiv-roleplayers.com/mybb18/images/reksio/flecha.png)
I think the corrupted crystals in the open world (like Eastern Thanalan's Burning Wall) could make someone sick over a longer period of time, but corrupted crystals in an aether-heavier place (like in Pharos Sirius) seem more likely to just explode. As far as I know there isn't really any lore about it, but that's my observation.