1. a copper iron sulfide mineral that is an important ore of copper, typically appearing bronze-colored with a purple tarnish
Usage: mineralogy

Examples

• The geologist identified bornite in the rock sample by its distinctive purple tarnish.
• Bornite is commonly found in copper deposits around the world.
• The mining company extracted bornite from the ore body to process for copper.
• Students learned to recognize bornite by its peacock-like iridescent colors.
• The mineral collection included a beautiful specimen of bornite with its characteristic bronze luster.
• Bornite often occurs alongside other copper minerals like chalcopyrite.