mineral

Likely chalcopyrite-bearing rock

Chalcopyrite (CuFeS₂), possibly with an iron-oxide coating

AI-generated identification · may be incorrect

Brassy yellow metallic patches with silvery-gray areas; chalcopyrite has Mohs hardness 3.5–4, a tetragonal crystal structure, and poor cleavage. The photograph does not show enough detail for a definitive identification.

Identified October 8, 2026More mineral →

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Physical properties

Formation & geological history

Chalcopyrite commonly forms in hydrothermal veins and in igneous-related copper deposits, often alongside pyrite and other sulfides. Such deposits range widely in geological age.

Uses & applications

Chalcopyrite is a major copper ore; attractive specimens are collected, though this small rough fragment appears more suitable for a basic collection than jewelry.

Geological facts

Its bright brass color can resemble gold, but chalcopyrite is softer and typically tarnishes to iridescent colors.

Field identification & locations

Look for a metallic luster, brassy color, and a dark streak; a simple image cannot confirm the mineral or distinguish a coating from the underlying material. Common sources include copper deposits in Chile, Peru, and the United States.