mineral

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Hardness: 6-6.5 (Pyrite) / 7 (Quartz); Color: Brass-yellow (Pyrite), White/Transparent (Quartz); Luster: Metallic (Pyrite), Vitreous (Quartz); Crystal Structure: Isometric (cubic/pyritohedral), Hexagonal (Quartz); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Hardness: 6-6
Color: Brass-yellow (Pyrite), White/Transparent (Quartz)
Luster: Metallic (Pyrite), Vitreous (Quartz)

Identified July 19, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins at a variety of temperatures by the precipitation of sulfide and silicate minerals from hot, mineral-rich fluids. It can also occur as an accessory mineral in igneous, metamorphic, and sedimentary rocks.

Uses & applications

Source of sulfur and sulfuric acid in industry; historical source of sparks for firearms; widely used as a collector specimen and in costume jewelry.

Geological facts

Commonly known as Fool's Gold due to its resemblance to precious metal. Historically used in the 'wheel lock' firearms to ignite gunpowder. It is the most common sulfide mineral found on Earth.

Field identification & locations

Identify by its metallic luster, golden color, and green-black streak (unlike real gold). Commonly found in mines in Peru, Spain, Italy, and the USA. This specimen is a 'cluster' or 'combination' piece featuring Druzy Quartz.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

sedimentary

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

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Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

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