mineral

Pyrite in Matrix

Iron Sulfide (FeS2)

Hardness: 6-6.5 Mohs; Color: Brass-yellow, metallic gold; Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Hardness: 6-6
Color: Brass-yellow, metallic gold
Luster: Metallic

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Brass-yellow, metallic gold; Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in a variety of geological environments including hydrothermal veins, sedimentary rocks through biological reduction of sulfates, and as an accessory mineral in igneous rocks.

Uses & applications

Primary source of sulfur and sulfuric acid. Used in various industrial processes, jewelry (as marcasite), and popular among mineral collectors.

Geological facts

Often called 'Fool's Gold' due to its resemblance to real gold, though it is much harder and more brittle. It is capable of producing sparks when struck against steel or flint.

Field identification & locations

Identify by its brassy color, cubic crystal habits (when well-formed), and green-black streak on a porcelain plate. Common in mining districts worldwide.