mineral

Tumbled pyrite (likely)

Pyrite, FeS₂; possibly a pyrite-rich sulfide specimen

AI-generated identification · may be incorrect

Rounded, polished pebble with metallic silvery-brassy luster and granular sparkle. Pyrite has Mohs hardness 6–6.5, cubic crystal structure, poor cleavage, and specific gravity about 5.0; the image cannot confirm composition, and it could also be metallic hematite or another sulfide.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in hydrothermal veins, sedimentary rocks, coal beds, and metamorphic environments through sulfide mineralization, ranging from ancient to modern geological ages. Tumbled specimens are mechanically polished from mined material.

Uses & applications

Used historically as a sulfur source and currently in mineral collecting, educational specimens, and decorative objects; it is not generally used as a gemstone because it can tarnish and be brittle. Common pieces sell for modest prices.

Geological facts

A diagnostic fresh streak is greenish-black to brownish-black, unlike gold’s yellow streak; pyrite may emit sulfurous odor when struck or heated, but testing is unnecessary and potentially damaging.

Field identification & locations

Commonly found in Spain, Peru, Italy, China, Russia, and the United States. Test cautiously with streak and hardness: pyrite scratches glass, while hematite typically does not; avoid acid or destructive tests.