mineral

Pyrite in Quartz Matrix

Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)

Hardness: 6-6.5 (Pyrite) and 7 (Quartz); Color: Brass-yellow metallic grains in white/translucent matrix; Luster: Metallic and vitreous; Crystal structure: Cubic (pyrite) and hexagonal (quartz); Specific Gravity: 4.8-5.1 (pyrite).

Hardness: 6-6
Color: Brass-yellow metallic grains in white/translucent matrix
Luster: Metallic and vitreous

Identified July 9, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms in hydrothermal veins or as an accessory mineral in igneous and metamorphic rocks. It forms when sulfur-rich fluids interact with iron-bearing minerals at high temperatures and pressures beneath the Earth's surface.

Uses & applications

Pyrite was traditionally used as a source of sulfur and sulfuric acid. Today, specimens are used for educational purposes, collection, and occasionally in jewelry as marcasite (though scientifically distinct). Quartz is used in electronics and glass manufacturing.

Geological facts

Pyrite is famously known as 'Fool's Gold' because its color and luster often led amateur prospectors to confuse it with real gold. It can actually contain trace amounts of real gold within its structure. It can strike sparks when hit against steel.

Field identification & locations

Identify in the field by its metallic brassy sheen, hardness (it can scratch glass unlike gold), and green-black streak. Commonly found in mine tailings, mountain ranges, and sedimentary basins worldwide.

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