Something burnt? :-D I have a collection of crap I have found in charcoal bags. Everything from rocks to pieces of fiberglass insulation. Mostly from Royal Oak.
If Wicked is an imported lump I'd bet that it was made in a large pit in the ground covered wth a big metal plate. I've seen the picture before of how they do it but can't find it. It is probably some orange dirt or clay from when they were shoveling it out of the pit.