Fusic material
Depending on the fire temperature, this material can appear in burnt peat as two forms:
1 Red to brown coloured fused ceramic, brick-like material comprising dominantly of haematite and maghemite minerals that form at 3000C to 5000C.
Photo credit: R Fitzpatrick
2 Glass-like material that can form at extremely high temperatures (600 to >8000C).
Photo credit: R Fitzpatrick