mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale. Color: brass-yellow/pale gold. Luster: metallic. Crystal structure: Isometric (often cubic or pyritohedral). Cleavage: indistinct. Specific Gravity: 4.9-5.2.

Hardness: 6-6
Color: brass-yellow/pale gold
Luster: metallic

Identified July 14, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale. Color: brass-yellow/pale gold. Luster: metallic. Crystal structure: Isometric (often cubic or pyritohedral). Cleavage: indistinct. Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in a variety of geological environments including sedimentary deposits, hydrothermal veins, and as an accessory mineral in igneous and metamorphic rocks. It forms under reducing conditions often in the presence of organic matter.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today it is used in jewelry (as marcasite), in solar panels, battery production, and as a popular collector specimen.

Geological facts

Commonly known as Fool's Gold because of its visual similarity to real gold, though it is much harder and more brittle. It can act as a natural transistor and was used in early radio detectors.

Field identification & locations

Identify by its cubic habit, greenish-black streak (real gold has a yellow streak), and sulfurous smell when struck or heated. Found globally, with notable deposits in Spain, Peru, and the USA.