mineral
Peacock Ore
Bornite (Cu5FeS4)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, metallic luster, and distinct iridescent purple, blue, and green tarnish. It has an isometric crystal system and a dark grayish-black streak.
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Physical properties
Hardness of 3 on the Mohs scale, metallic luster, and distinct iridescent purple, blue, and green tarnish. It has an isometric crystal system and a dark grayish-black streak.
Formation & geological history
Forms in hydrothermal veins and igneous intrusions through copper-rich hydrothermal fluid precipitation. Often found in association with other copper sulfides.
Uses & applications
Primarily mined as a copper ore and valued by collectors for its vibrant iridescent tarnish.
Geological facts
Natural freshly broken bornite is brownish-bronze and only develops its famous peacock colors upon exposure to air and oxidation.
Field identification & locations
Identify by its colorful tarnish, soft copper core, and association with chalcopyrite. Common localities include Mexico, Peru, and the USA.
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Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous