El Carbun (anca Carbon o Carbù) a l'è un cumbüstibil fossil solid de culur negher o marun scür che'l se tröva in di rocc sedimentari. Anca lü'l se pö cunsideraa una rocia sedimentara, e l'antracite adiritüra una rocia metamorfiga perchè l'ha passaa un'espusiziun a temperadür e pressiun grand. El carbun a l'è faa per la püssee part de carboni e una quantità variabila de alter element 'me el sulfer, idrogen, ussigen e azot. El carbun al gh'ha urigin de la sedimentaziun de strat de piant e alter rest vegetaj, che prutegiüü de la biodegradaziun e de la ussidaziun de l'aria, s'hinn trasfurmaa dopu d'un frach de temp in del carboni.
El carbun a l'è la funt principala d'energia per la prudüziun d'eletricità in del mund (pressapoch el 40%).
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