mineral

Pyrite

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Hardness: 6-6
Color: Pale brass-yellow
Luster: Metallic

Identified July 4, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric (cubic or pyritohedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2

Formation & geological history

Forms in high and low temperature hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and in sedimentary rocks such as shale and coal. It is found in geological settings ranging from Precambrian to modern times.

Uses & applications

Used primarily as an ore of sulfur and for the production of sulfuric acid. In the past, it was used in jewelry (as marcasite) and as a spark-starter in firearms. Today, it is popular for mineral collecting.

Geological facts

Commonly known as 'Fool's Gold' because its color and metallic luster frequently led inexperienced gold prospectors to mistake it for the real thing. It can actually contain small amounts of actual gold as inclusions.

Field identification & locations

Identify by its hardness (will scratch glass), greenish-black streak (unlike gold\'s yellow streak), and cubic crystal shape. Found globally, with notable deposits in Spain, Peru, and the USA. It is often found near quartz veins.