Empressite or tellursilberblende is a mineral form of silver telluride, AgTe.

Recent crystallographic analysis[5] has confirmed that empressite is a distinct mineral with orthorhombic crystal structure, different from the hexagonal Ag5−xTe3 with which empressite has been commonly confused in mineralogy literature.

At the same time, empressite does not appear on the equilibrium Ag-Te phase diagram,[6] and therefore it is only metastable at ambient conditions.

The name empressite comes from the location of its discovery – the Empress Josephine mine, Saguache County, Colorado, US.

[4] This article about a specific mineral or mineraloid is a stub.