Wurtzite is a zinc and iron sulfide mineral with the chemical formula (Zn,Fe)S, a less frequently encountered structural polymorph form of sphalerite.

[2] It occurs in hydrothermal deposits associated with sphalerite, pyrite, chalcopyrite, barite and marcasite.

[2] It was first described in 1861 for an occurrence in the San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia, and named for French chemist Charles-Adolphe Wurtz.

In Europe it is reported from Příbram, Czech Republic; Hesse, Germany; and Liskeard, Cornwall, England.

This structure is a member of the hexagonal crystal system and consists of tetrahedrally coordinated zinc and sulfur atoms that are stacked in an ABABABABAB pattern.