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Pellets are processed wood waste (sawdust, turnings, chips) compressed at high pressure. This process occurs without any additional binders, all due to cellulose content in wood. Cellulose is a complex chemical compound which acts as glue for particular cells and cellulose fibres.
Phytogenic sedimentary rock with 75-97% carbon content, formed mostly in the Carboniferous period (Palaeozoic) of plant debris carbonified without access of oxygen. It is black, mat and black fracture.