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Brown or black, solid or semi-solid, bituminous substance made almost entirely of carbon and hydrogen. It melts between 65 and 95 °C and is soluble in carbon disulphide. It is formed by the evaporation of volatile hydrocarbons and occurs in oil-bearing rocks, e.g. in Trinidad, or as a residue from petroleum refining.

Subjects: Earth Sciences and Geography — Architecture.

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