mineral

Pyrulite (Pyrite / Chalcopyrite)

Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)

Hardness: 6-6.5 (Pyrite) or 3.5-4 (Chalcopyrite); Color: Brass-yellow to golden brown; Luster: Metallic; Crystal Structure: Isometric/Cubic or Tetragonal; Cleavage: Indistinct; Specific Gravity: 4.1-5.0

Hardness: 6-6
Color: Brass-yellow to golden brown
Luster: Metallic

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins, Kontaktmetamorphic deposits, or as an accessory mineral in igneous and sedimentary rocks. Common in deposits associated with volcanic activity or deep-sea vents.

Uses & applications

Primary source of copper (for Chalcopyrite) or used in the production of sulfuric acid; used in jewelry as marcasite and highly valued as decorative collector specimens.

Geological facts

Commonly known as 'Fool's Gold' due to its resemblance to precious metals. Pyrite can actually spark when struck against steel, which made it important for early firearms (wheellocks).

Field identification & locations

Identify in the field by its metallic luster, golden hue, and green-black to brownish-black streak (real gold has a yellow streak). Found globally in mining districts like Peru, Spain, and the USA.

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