mineral

Quartz with Chalcopyrite

Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)

Hardness: Quartz (7) and Chalcopyrite (3.5-4); Color: White matrix with brassy yellow metallic minerals; Luster: Vitreous to metallic; Crystal Structure: Trigonal quartz with tetragonal chalcopyrite; Cleavage: None/Indistinct; Specific Gravity: 2.65 (Quartz) to 4.2 (Chalcopyrite).

Hardness: Quartz (7) and Chalcopyrite (3
Color: White matrix with brassy yellow metallic minerals
Luster: Vitreous to metallic

Identified June 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins and magmatic segregations where sulfide-rich fluids crystallize within quartz fissures. Found in various geological ages where volcanic or tectonic activity has occurred.

Uses & applications

Chalcopyrite is the most important ore of copper. These specimens are also popular for mineral collecting and as decorative pieces.

Geological facts

Chalcopyrite is often mistaken for gold and is known as 'Fool\'s Gold,' though it is yellower and softer than actual gold. When weathered, it can develop a colorful iridescent tarnish called 'Peacock Ore'.

Field identification & locations

Identify in the field by looking for metallic golden flecks within a translucent or white quartz matrix; check hardness as it will scratch easily compared to gold. Commonly found near copper mines or metamorphic belts.

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