mineral

Pyrite (on host rock)

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: brassy yellow, pale gold; Luster: metallic; Crystal structure: Isometric (cubic/pentagonal dodecahedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Hardness: 6-6
Color: brassy yellow, pale gold
Luster: metallic

Identified April 7, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: brassy yellow, pale gold; Luster: metallic; Crystal structure: Isometric (cubic/pentagonal dodecahedral); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in high and low temperature hydrothermal veins, as a magmatic segregation mineral, or as a replacement mineral in sedimentary rocks. It is found in deposits ranging from Precambrian to modern times.

Uses & applications

Historically used as a source of sulfur for creating sulfuric acid. Today, it is used in the manufacture of lithium batteries, as a sun-shielding material in windows, and as a popular collector's mineral and jewelry gemstone (often sold as 'marcasite').

Geological facts

Known as 'Fool's Gold' due to its resemblance to real gold. Unlike gold, pyrite is brittle and leaves a greenish-black streak on a porcelain plate. It can actually contain trace amounts of real gold within its structure.

Field identification & locations

Identify by its metallic luster, 'gold' color, and cubic crystal habits. In the field, look for it in quartz veins or dark sedimentary shales. It will not scratch as easily as gold and will spark when struck with steel.