mineral

Pyrite cluster in a sulfide-rich ore matrix

Pyrite, FeS₂, likely with pyrrhotite and/or chalcopyrite in matrix

AI-generated identification · may be incorrect

Brassy yellow metallic luster, opaque, cubic or pyritohedral crystals, uneven granular matrix; Mohs hardness 6–6.5 and specific gravity about 5.0. The dark gray host may contain other iron sulfides or quartz.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Hydrothermal or magmatic sulfide mineralization formed when sulfur-rich fluids crystallized in fractures or ore bodies, commonly during the Paleozoic–Mesozoic or younger. Exact age and locality require testing or provenance.

Uses & applications

Collected as a mineral specimen and used historically as a source of sulfur and minor iron; similar sulfide ores are economically important for copper, nickel, and gold. Not suitable for jewelry because it can tarnish, fracture, and oxidize.

Geological facts

Pyrite is called “fool’s gold,” but its cubic crystals and greater hardness distinguish it from gold. Oxidation can produce acidic drainage and iron-sulfate crusts.

Field identification & locations

Identify by brass-yellow color, metallic shine, brittle fracture, cubic crystal faces, and a dark sulfide matrix; it will not flatten under a knife and is not malleable like gold. Common localities include Peru, Spain, Italy, China, the United States, and Canada.