mineral

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly as crystals in a dark host rock

AI-generated identification · may be incorrect

Brassy silver-gold sparkle with a metallic luster and granular, uneven surface. Pyrite has Mohs hardness 6–6.5 and a cubic crystal structure; the specimen’s host rock and exact properties cannot be determined from the photo.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite forms in many settings, including hydrothermal veins and sedimentary rocks, when iron and sulfur combine under low-oxygen conditions. Its age depends on the host deposit and cannot be estimated visually.

Uses & applications

Pyrite is collected as a mineral specimen and historically used as a source of sulfur and sulfuric acid; attractive crystals may be used decoratively, but this piece does not appear gem-quality.

Geological facts

Pyrite is commonly called “fool’s gold,” though its metallic sparkle can also look silvery in photographs.

Field identification & locations

Look for metallic luster, relatively hard crystals, and a dark greenish-black streak; pyrite is widespread in sedimentary rocks and ore veins. The photo suggests pyrite, but a streak or closer view would help confirm it.