Presumably these things are called zappatites or maybe frankmites?I was once told that under farmland, uric acid could leach in and lead to a pale yellow colour in cave formations. I don't know how accurate that is, but it's a good one to tell kids on caving trips. There are probably numerous minerals it could be though, depending on the local geology. Where are these formations?
Yes, these are also under farmland, in a disused Cotswold underground stone quarry. We joked that this was crystallised sheep's piss, but it's arable land above. And like Tim Rose's Portland caves, "There's only 5 to 10 m of 'ground' above this and the soil layer is pretty thin."I was once told that under farmland, uric acid could leach in and lead to a pale yellow colour in cave formations. There are probably numerous minerals it could be though, depending on the local geology. Where are these formations?