Welcome to Mount Gloop.
I don’t know what this mountain is made of - like most of the naturalistic landforms I discover, it’s not supposed to be there. It’s probably some sort of residue or gunk. It rises out of a plane of semiconductor laser material. Those two features at the upper right are actually little bumps in the semiconductor, where it didn’t stick very well to the glass underneath.
Mount Gloop is not particularly mighty - its airy summit rises about 2 microns above the plane. It would take about 50 Mount Gloops to equal the thickness of a single human hair.
Fortunately, this feature’s pretty far away from the structures I was actually trying to make, so I don’t mind it sitting there, being scenic.