What is this minecraft?

That was random about my spawn, there are a lot of them, looks a bit like a graveyard. Have looked underneath there's nothing except for a few water

There are more in the biome

This is nothing. In spruce forests there are often stones covered in moss for no reason

Biome-specific structures. Bring nothing, do nothing, are relatively common in the biome

But what is that?

Biome-specific structures

Also called stones

Is called "Mossy Cobblestone", in German "Bemooster Bruchstein"

They often spawn randomly in the biome, but they mean nothing and there's nothing buried underneath…

This is a mossy quarry stone. He decorates the biome and is supposed to represent a stone or a boulder.