mineral

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Hardness: 6-6.5 (Mohs); Color: Brass-yellow or light gold; Luster: Bright Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2.

Hardness: 6-6
Color: Brass-yellow or light gold
Luster: Bright Metallic

Identified March 16, 2026More mineral →

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Physical properties

Hardness: 6-6.5 (Mohs); Color: Brass-yellow or light gold; Luster: Bright Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Poor/Indistinct; Specific Gravity: 4.9-5.2.

Formation & geological history

Formed in high-temperature hydrothermal veins, sedimentary rocks under reducing conditions, or through contact metamorphism. It is found in geological settings ranging from Precambrian to more recent igneous intrusions.

Uses & applications

Historically used for sulfur production and sulfuric acid; today it is used in the manufacture of lithium batteries, as a flux in glass making, and as a popular specimen for gemstone collectors and jewelry.

Geological facts

Commonly known as "Fool's Gold" due to its visual similarity to real gold. Unlike real gold, it is brittle and will shatter if struck with a hammer. It can produce sparks when struck against steel, which led to its name (from the Greek word 'pyr' meaning fire).

Field identification & locations

Identify by its cubic crystal habit and green-black streak on a porcelain plate. It is found globally, with famous deposits in Spain, Italy, and the USA. Collectors should look for sharp crystal faces and lack of 'tarnishing' or 'pyrite disease' (oxidation).