mineral

Likely pyrite (“fool’s gold”) fragment

Pyrite, FeS₂

AI-generated identification · may be incorrect

Brassy yellow metallic luster with granular, sparkly crystals; Mohs hardness 6–6.5, cubic crystal system, no prominent cleavage, specific gravity about 5.0. The tiny specimen’s identity cannot be confirmed from the image alone.

Identified October 5, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sedimentary rocks, hydrothermal veins, and metamorphic deposits when iron and sulfur combine under low-oxygen conditions; pyrite occurs across a wide range of geological ages.

Uses & applications

Used historically as a source of sulfur and in demonstrations or collections; attractive crystals are collected, but this small rough fragment has little practical or jewelry use.

Geological facts

Pyrite can form cubes and other striking crystal shapes, and its metallic appearance has often led it to be mistaken for gold.

Field identification & locations

Look for a brassy color, metallic sheen, and brittle fracture; unlike gold, pyrite is hard and tends to crumble rather than flatten. Found worldwide, including in sedimentary deposits and mineral veins.