u/Maximum-Switch-9860

I clean airbnbs in a popular mountain destination with some beautiful views and creeks. While vacuuming, i noticed a large lump under a rug and stuck my vacuum under there to get it, i thought it was sand, but it’s grey and a very fine powder with no large grains. Does this look like ashes? There is no sand anywhere near here that looks like this, and going up to the top of a mountain to spread ashes isn’t too uncommon here. What do ashes feel like when rubbed between the fingers? And if it’s not ashes, what would it be? The picture is not very good, but I don’t really want to dump it out.