mineral

Pyrite on Quartz (Fool's Gold in Quartz)

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Hardness: 7 (Quartz) and 6-6.5 (Pyrite); Color: Colorless/White crystals with brassy-yellow metallic inclusions; Luster: Vitreous to Adamantine (Quartz) and Metallic (Pyrite); Crystal Structure: Hexagonal prisms (Quartz) and Cubic/Pyritohedron (Pyrite); Cleavage: Indistinct/None;…

Hardness: 7 (Quartz) and 6-6
Luster: Vitreous to Adamantine (Quartz) and Metallic (Pyrite)

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins through the precipitation of silica-rich and sulfur-rich fluids at high temperatures and pressures. These specimens are often found in metamorphic or igneous environments and can range from millions to hundreds of millions of years in age.

Uses & applications

Primarily used as decorative display specimens, for crystal healing/metaphysical collections, and occasionally as a source of iron or sulfur in industrial processing, though silica is widely used in glass and electronics.

Geological facts

Historically called 'Fool's Gold' because its metallic luster and yellow hue deceived prospectors. When struck against steel, Pyrite produces sparks, which led to its name derived from the Greek word 'pyr' meaning fire.

Field identification & locations

Identifiable by the contrast between clear/white pointed crystal points and the sparkly, brassy metallic flecks. Found commonly in Peru, China, and the USA (Arkansas/Arizona). Collectors look for undamaged crystal terminations and bright, unoxidized pyrite.

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