mineral

Pyrite in Quartz

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Hardness: 7 (Quartz) and 6-6.5 (Pyrite). Color: Colorless to white quartz with metallic brassy-yellow pyrite. Luster: Vitreous to metallic. Crystal Structure: Hexagonal (Quartz) and Isometric/Cubic (Pyrite).

Hardness: 7 (Quartz) and 6-6
Color: Colorless to white quartz with metallic brassy-yellow pyrite
Luster: Vitreous to metallic

Identified July 1, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins where hot, mineral-rich fluids circulate through fractures in rocks, precipitating quartz and sulfide minerals as they cool. Common in igneous and metamorphic environments.

Uses & applications

Used primarily as decorative specimens for collectors, metaphysical purposes, and sometimes as a minor source of sulfur or iron, though quartz is used in electronics and glass-making.

Geological facts

Pyrite is famously known as Fool's Gold due to its resemblance to precious metal. When found inside quartz, it creates a striking contrast that is highly prized by mineral collectors.

Field identification & locations

Identify by looking for the metallic gold-colored flecks or cubes embedded within a translucent or white hard matrix that cannot be scratched by a steel knife. Common in mining districts worldwide, such as Peru, Spain, and the USA.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock