Claude François Geoffroy (1729 – 18 June 1753) was a French chemist.
Before this time, bismuth-containing minerals were frequently misidentified as either lead, tin, or antimony ores.
His observations on the matter were published in the Mémoires de l’académie française in 1753.
[1][2] He became a master apothecary in 1748, and in 1752 he was admitted to the Académie des sciences as a supernumerary adjoint chemist.
[3] He is known as Claude Geoffroy the Younger to distinguish him from his father Claude Joseph Geoffroy (1685–1752), also a French chemist and apothecary, member of the Académie des sciences.