Fornacite is a rare lead, copper chromate arsenate hydroxide mineral with the formula: Pb2Cu(CrO4)(AsO4)(OH).

It forms a series with the phosphate mineral vauquelinite.

It was first described in 1915 and named after Lucien Lewis Forneau (1867–1930) the governor of the French Congo.

[3] It occurs in the oxidized zone of ore deposits and is associated with dioptase, wulfenite, hemihedrite, phoenicochroite, duftite, mimetite, shattuckite, chrysocolla, hemimorphite, willemite and fluorite.

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