mineral

Pyrite in Matrix (likely Quartz or Coal)

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9–5.2.

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

Identified April 3, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Pale brass-yellow to golden; Luster: Metallic; Crystal Structure: Isometric/Cubic; Cleavage: Indistinct; Specific Gravity: 4.9–5.2.

Formation & geological history

Formed in variety of geological environments: hydrothermal veins, sedimentary rocks under reducing conditions, and contact metamorphic deposits. Often associated with quartz or coal beds in this dark matrix form.

Uses & applications

Historically used as a source of sulfur and sulfuric acid. Today, it is primarily used in commercial jewelry (as marcarsite), as a minor ore of iron, and as a popular collector's specimen.

Geological facts

Known as 'Fool's Gold' due to its resemblance to real gold. Unlike gold, pyrite is brittle and creates sparks when struck against steel, which led to its name derived from the Greek word 'pyr' meaning fire.

Field identification & locations

Identify by its brassy color, cubic crystal habits, and brittle nature (gold is soft and malleable). It leaves a greenish-black streak on a porcelain plate, whereas gold leaves a yellow streak.

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