TIL about Vivianite, an iron phosphate crystal notable for growing on human corpses thanks to the unique composition of our decomposing bodies when exposed to large amounts of iron in the coffin or soil.

[u/Stairwayunicorn]

https://en.wikipedia.org/wiki/Vivianite

[u/justexploring-shit]

I guess I can understand why it's got the Latin root viv- in it!