Joseph Jean Baptiste Xavier Fournet (May 15, 1801 – January 8, 1869), French geologist and metallurgist, was born at Strasbourg.

[1] He was a man of wide knowledge and extensive research, and wrote memoirs on chemical and mineralogical subjects, on eruptive rocks, on the structure of the Jura, the metamorphism of the Western Alps, on the formation of oolitic limestones, on kaolinization and on metalliferous veins.

On metallurgical subjects he also was an acknowledged authority; and he published observations on the order of sulphurability of metals (loi de Fournet).

His chief publications were: Études sur les dépôts métallifères (Paris, 1834); Histoire de la dolomie (Lyon, 1847); De l'extension des terrains houillers (1855); and Géologie lyonnaise (Lyon, 1861).

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