mineral

Iron-rich sulfide nodule (likely pyrite-bearing)

Likely pyrite (FeS₂) and iron oxides/hydroxides, possibly a weathered sulfide concretion

AI-generated identification · may be incorrect

Brassy yellow metallic patches occur in a rusty brown, rounded matrix; hardness and crystal structure cannot be determined reliably from the image. The brown coating is consistent with iron-oxide weathering products such as goethite or limonite.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as sulfide minerals precipitated or concentrated in sediment or rock, then became rounded and oxidized during weathering; age and exact setting cannot be inferred from the photo.

Uses & applications

Small specimens are mainly collected for display or study; pyrite is also used in mineral collections and historically as a source of sulfur.

Geological facts

Pyrite commonly weathers to rusty iron oxides, which can obscure its original brassy metallic appearance.

Field identification & locations

Look for metallic brassy grains and a rusty coating; a streak test and hardness test can help distinguish pyrite from softer gold, but avoid testing valuable specimens. Identification from this image is tentative.