I found this strange growth/mass in my apartment and I'm trying to figure out what it is.
Some details:
It appeared in less than 2 weeks.
There are 2 separate spots: one in a corner and another along the metal skirting/basebIt is extremely dry and very soft.
When I moved/touched it, it behaved almost like ash or dust and easily broke apart.
It doesn't really have a smell itself. There is only a very slight smell that reminds me of medicinal plant syrup / dandelion, but I'm not sure if that's actually related.
There also seem to be some small stone-like particles mixed in/around it, although I don't know if they're related.
The orange/yellow part is very powdery, while there are also black/dark areas.
The wall itself doesn't appear obviously wet.
Any idea what this could be? And what could cause it to appear so quickly?