lignite

Noun
  1. Intermediate between peat and bituminous coal (synset 114839433)
    is a type of:
    • coal - fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
    • humate - material that is high in humic acids
    subtypes: jet - a hard black form of lignite that takes a brilliant polish and is used in jewelry or ornamentation
    same as: brown coal, wood coal

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