Algae which grows in iron rich water which is run off from old mine workings.
No identification made yet.
No interactions present.
Is it algae or ochre, a chemical precipitate?
not biological. Mine-water contains a lot of iron, and a typical reaction is that of iron sulphide (pyrites) being oxidised to the sulphate (copperas): this then precipitates as the oxide or hydroxide.
There is usually a high acidity (low pH) and high chloride (salt) content associated with mine-water - these tend to make conditions hostile to most living organisms.
Likely to be one of the ferric iron complexes, as noted above. There is a programme of remediation aiming to address many of these mine water issues in Wales - but of course there are many old mines!
Lat/Lng: 51.7357, -3.755
OS grid ref: SN789055