mineral

Pyrite (likely)

Pyrite, FeS₂

AI-generated identification · may be incorrect

Brassy yellow, metallic luster, and granular to crystalline texture; Mohs hardness 6–6.5, cubic crystal system, poor cleavage, and specific gravity about 5.0. The small specimen’s appearance is consistent with pyrite, though the image alone cannot confirm the identification.

Identified October 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when iron and sulfur combine in low-oxygen settings, including sedimentary rocks, hydrothermal veins, and metamorphic deposits. It occurs across many geological ages.

Uses & applications

Used as a source of sulfur and historically for sulfuric acid production; also collected as a display mineral. Jewelry use is limited because it can tarnish and is brittle.

Geological facts

Nicknamed “fool’s gold,” pyrite is harder and more brittle than gold and often forms cubic crystals.

Field identification & locations

Look for a brassy metallic color, substantial heft, and brittle fracture; unlike gold, pyrite usually leaves a dark streak. Common worldwide in sedimentary and hydrothermal deposits; value is typically about $2–$20 for a small, common specimen.