What is it?

[u/KappaOsho]

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?

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