Here is a whopping 5 1/2lb pioneer swirl chunk!
Slag created from an iron ore furnace back in 1857.
Only a small pile was deposited of this variety, whereas 99% of all the other slag in this location is black, grey or green.
There is no more of this slag that can be collected from the site.
Dimensions:
4 x 6 x 3 1/2 inches