Quartz with Chalcopyrite and Pyrite

Physical Properties

Hardness: 7 (Quartz), 3.5-4 (Chalcopyrite); Color: Clear to light green (Quartz), brassy yellow (sulfides); Luster: Vitreous to metallic; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Indistinct.

Formation & Geological History

Formed in hydrothermal veins and magmatic deposits where mineral-rich hot fluids circulate through rock fractures and cool, allowing crystals to precipitate. Commonly found in metamorphic and igneous environments.

Uses & Applications

Predominantly used as a collector specimen and for metaphysical purposes. Quartz is used in electronics and glass-making, while chalcopyrite is a primary ore of copper.

Geological Facts

This specimen shows 'drusy' or crystalline quartz growth with metallic sulfide inclusions. Chalcopyrite is often called 'Peacock Ore' when it tarnishes, though here it retains its raw brassy luster.

Field Identification & Locations

Identify by the hexagonal crystal points of the quartz and the metallic, golden-yellow flecks of the chalcopyrite. It can be found in mining districts worldwide, particularly in Peru, Mexico, and the USA.

Identified on: 4/21/2026

Mode: Standard