I thought I should share some highly mystifying specimen from my personal collection of fieldwalking finds:

I've been collecting rocks, fossils and all kinds of artifacts that I found fieldwalking or by other means practically my whole life. Oddly enough, over the past few years I keep unearthing more and more what seems to be not only molten, but also vitrified bricks and small bits of molten/vitrified soil, looking a bit like slag at...

Photos of Molten & Vitrified Bricks and Soil From My Personal Collection