metamorphic
Chalcopyrite-bearing metamorphic rock (possibly bornite/chalcopyrite ore)
Likely quartz–sulfide rock containing chalcopyrite (CuFeS₂); identification from the image is tentative
AI-generated identification · may be incorrectDark gray, rough and massive, with brassy iridescent patches and a white quartz-like band. Chalcopyrite has Mohs hardness 3.5–4, metallic luster, tetragonal crystals; quartz is Mohs 7 and vitreous. Specific gravity varies with sulfide content.
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Physical properties
Dark gray, rough and massive, with brassy iridescent patches and a white quartz-like band. Chalcopyrite has Mohs hardness 3.5–4, metallic luster, tetragonal crystals; quartz is Mohs 7 and vitreous. Specific gravity varies with sulfide content.
Formation & geological history
May have formed through hydrothermal mineralization and later metamorphism; exact age and geological setting cannot be determined from the photo.
Uses & applications
Copper sulfide ores are mined for copper; attractive pieces may be kept as teaching or collector specimens.
Geological facts
Iridescent tarnish on copper sulfides can resemble a rainbow-colored surface, but color alone cannot distinguish chalcopyrite from related minerals.
Field identification & locations
Look for brassy metallic grains, dark host rock, and quartz veins; a streak or hardness test and mineral analysis would help confirm the identification. Copper sulfides occur in many hydrothermal and metamorphosed ore deposits worldwide.
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