The ceramic like stuff is exotic hardwoods. Almost as hard, heavy and glassy as coal.
The stuff that you say burns cold without air (is thag the stuff in the picture?) Sounds like native charcoal that has been over cooked in the coaling process. Will forge fine if prone to producing lots of ash and maybe soarks deoending on species
The stuff that you say burns cold without air (is thag the stuff in the picture?) Sounds like native charcoal that has been over cooked in the coaling process. Will forge fine if prone to producing lots of ash and maybe soarks deoending on species