mineral
Chalcopyrite in Matrix
CuFeS2
AI-generated identification · may be incorrectHardness of 3.5 to 4 on the Mohs scale, brass-yellow to golden color with often iridescent tarnish, metallic luster, and a greenish-black streak.
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Physical properties
Hardness of 3.5 to 4 on the Mohs scale, brass-yellow to golden color with often iridescent tarnish, metallic luster, and a greenish-black streak.
Formation & geological history
Forms in hydrothermal vein deposits and igneous or metamorphic rock settings through the precipitation of copper and iron sulfides from hot solutions.
Uses & applications
Primary ore of copper used extensively in electrical wiring and metal alloys, and collected as mineral specimens for display.
Geological facts
Often called fool's gold due to its metallic yellow appearance, but it is softer and darker than pyrite, and tarnishes to purple and blue hues.
Field identification & locations
Identified by its distinctive brassy yellow color, softness, and dark streak, commonly found in major copper-producing regions worldwide.
