המועדפים של jarnbrak

Iron bacteria film on the surface of a puddle.

An iridescent film in the water caused by iron bacteria.

Surface film produced by the bacterium, Leptothrix discophora.

See: https://pubs.usgs.gov/of/1996/0081/report.pdf

Beautiful rainbows caused by iron bacteria.

A shiny film seeping out of the banks.

This was my holy grail find and is my favorite to date. As such I feel it deserves its own entry (usually I compile images of iron films I come across in photosets to avoid spam).