Charcoal

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Pieces of charcoal. The wooden structure is clearly visible.

Charcoal is almost pure carbon. It is producted by heating biological material (usually wood) in an anoxic environment, causing the volatiles to boil off. The process is essentially the same as that used to produce coke from coal.

Charcoal stick for drawing and writing

One possible use of charcoal in a Martian settlement is the creation of terra preta for the greenhouses.