mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

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

Hardness: 6-6
Color: Brass-yellow
Luster: Metallic

Identified May 30, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in diverse environments including igneous, metamorphic, and sedimentary rocks. It can precipitate from hydrothermal fluids or form in oxygen-depleted sedimentary environments via biological activity.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is used in the production of lithium batteries, crystal radio receivers, and as a popular collector specimen/jewelry stone.

Geological facts

Known as 'Fool's Gold' because its color and metallic luster often cause it to be mistaken for real gold, though pyrite is much harder and more brittle. It is capable of creating sparks when struck against steel.

Field identification & locations

Identify in the field by its cubic crystal habit, greenish-black streak (on a streak plate), and brittle fracture. Found worldwide, with notable deposits in Spain, Italy, and the USA.