Berzelianite is a rare copper selenide mineral with the formula Cu2Se.

[2][3][4] It occurs as thin dendritic crusts or as fine-grained inclusions.

[6] It was named by James Dwight Dana to honor Jöns Jakob Berzelius, a Swedish chemist who is seen as the father of analytical chemistry.

He invented chemical symbol notation and discovered the elements cerium, selenium, silicon, and thorium.

[6] Berzelianite often occurs together with eucairite, clausthalite, tiemannite, umangite, klockmannite, aguilarite, crookesite, athabascaite, stromeyerite, polybasite, pearceite, gold, uraninite, pyrite, marcasite, calcite.