mineral

Pyrite in a host rock

Pyrite (FeS₂), embedded in a likely sedimentary or metamorphic matrix

AI-generated identification · may be incorrect

The dark metallic, glittering crystals are consistent with pyrite; pyrite has Mohs hardness 6–6.5, cubic crystal structure, and typically brass-yellow color, though this specimen appears dark in the lighting. The surrounding tan, porous host cannot be identified confidently from the image.

Identified October 6, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in a range of settings, including sedimentary rocks, hydrothermal veins, and metamorphic deposits; its age depends on the host formation. The image does not establish the specimen’s geological age or exact host rock.

Uses & applications

Pyrite is collected as a mineral specimen and has been used as a sulfur source; it is generally not used as an iron ore because of sulfur contamination.

Geological facts

Pyrite is commonly called fool’s gold, but its metallic luster and cubic crystals distinguish it from gold, which is softer and malleable.

Field identification & locations

Look for brassy metallic color, cubic or striated crystals, and a dark streak; this specimen’s reflective grains support pyrite identification, but a streak test would help confirm it. Pyrite occurs worldwide in sedimentary beds, veins, and metamorphic rocks.