Chalcopyrite Specimen with Peacock Iridescence

This item is a small, raw mineral specimen, approximately 1.5 to 2 centimeters in length, held between two fingers for scale. The specimen exhibits a complex, crystalline structure with a metallic luster characteristic of sulfide minerals. Its primary coloration is a deep brassy-yellow or golden hue, but it is most notable for its vibrant iridescent tarnish, featuring flecks of purple, blue, and orange, often referred to as 'peacock ore.' The texture is rough and uneven, showing irregular fracture patterns and a somewhat flaky or foliated appearance in certain sections where the mineral layers meet. The surfaces are highly reflective under direct light, emphasizing its metallic nature. There is evidence of some host rock or quartz-like matrix on the far right edge, which is more translucent and colorless compared to the metallic ore. The specimen shows no signs of synthetic polishing or tumbling, retaining its natural, jagged edges and uneven surface topography. Its condition appears stable, though common for this mineral, it may be brittle. This type of mineral is typically formed in hydrothermal veins and is a primary ore of copper.

I have examined the digital image of the Chalcopyrite specimen, commonly referred to as 'Peacock Ore.' The specimen measures approximately 1.5 to 2 cm, placing it in the 'thumbnail' or 'small cabinet' category for mineral collectors. Based on the metallic luster and the vibrant, iridescent oxidation showing shades of violet, blue, and magenta, the piece appears to be authentic Chalcopyrite. While the iridescence can occur naturally, it is frequently enhanced through a brief acid wash (typically citric or oxalic acid); however, this is a standard industry practice for this mineral and does not significantly detract from its market value at this scale. The condition appears stable with the typical jagged, brittle edges expected of sulfide minerals. The presence of a small amount of quartz/host matrix adds a degree of natural aesthetic appeal. From a market perspective, Chalcopyrite is an abundant copper ore, making this a common specimen rather than a rarity. Similar specimens are widely available in museum gift shops and mineral shows. The primary value drivers for this item are the intensity of the color and the crystal formation, though at this size, it remains an entry-level collector's piece. Limitation of Remote Appraisal: This valuation is based solely on visual inspection of the provided image. A definitive assessment of whether the tarnish is 100% natural or acid-enhanced is difficult without a physical inspection. To finalize a professional authentication, one would need to perform a streak test (yielding greenish-black) and measure specific gravity. Furthermore, verifying the absence of synthetic coatings would require a physical examination under a 10x or 20x loupe.