Hercynite is a spinel mineral with the formula FeAl2O4.

It occurs in high-grade metamorphosed iron-rich argillaceous (clay-containing) sediments as well as in mafic and ultramafic igneous rocks.

[2] It was first described in 1847 and its name originates from the Latin name for the Harz, Silva Hercynia, where the species was first found.

[2][3] Hercynite is a spinel of regular symmetry and normal cation distribution, but some disorder occurs in its structure.

This article about a specific oxide mineral is a stub.