bornite

Bornite is a specialized geological term used primarily in mineralogy and mining. It is frequently referred to as peacock ore due to its characteristic iridescent tarnish, which creates a vivid spectrum of colors on the surface of the mineral.

As a chemical compound, it is treated as a mass noun in technical contexts, referring to the mineral species as a whole. It is rarely used in plural form unless referring to distinct types or samples of the mineral in a laboratory setting.