metamorphic

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Pyrite (FeS₂) in a quartz-rich host rock, possibly mica schist

AI-generated identification · may be incorrect

Gray to silvery, granular and strongly sparkly, with brassy metallic patches likely pyrite; quartz-rich portions are hard (Mohs ~7), while pyrite is ~6–6.5. The specimen appears foliated or layered, with uneven fracture and metallic luster.

Identified September 15, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when silica-rich sedimentary rock underwent regional metamorphism, with later hydrothermal fluids depositing pyrite; age cannot be determined from the image. Commonly associated with metamorphic belts and sulfide veins.

Uses & applications

Primarily a teaching or collector specimen; pyrite is also studied as a sulfur and iron-bearing mineral, though it is not generally economical as an iron ore. The rock has little value for construction or jewelry.

Geological facts

Pyrite is often called “fool’s gold,” but its harder, more angular crystals and pale brass color distinguish it from native gold. Oxidation can produce rusty iron-oxide coatings and acidic drainage.

Field identification & locations

Look for brassy metallic grains, a dark streak, and a sulfurous or iron-oxide weathering halo; a streak test and hardness test can confirm pyrite. Common localities include Spain, Peru, Italy, China, and sulfide-bearing metamorphic terrains worldwide.