mineral

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Hardness: 6-6.5 on Mohs scale; Color: Brass-yellow or pale gold; Luster: Metallic; Crystal Structure: Isometric (cubes or pyritohedrons); Cleavage: Indistinct; Specific Gravity: Approx. 5.0

Hardness: 6-6
Color: Brass-yellow or pale gold
Luster: Metallic

Identified April 10, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Brass-yellow or pale gold; Luster: Metallic; Crystal Structure: Isometric (cubes or pyritohedrons); Cleavage: Indistinct; Specific Gravity: Approx. 5.0

Formation & geological history

Formed in hydrothermal veins, sedimentary rocks under reducing conditions, or metamorphic rocks. This specimen likely formed via hydrothermal precipitation where hot, mineral-rich fluids filled cracks in older host rock.

Uses & applications

Major ore for sulfur and sulfuric acid production; historically used in firearms (wheel-locks) and fire-starting. Primarily used today for student educational kits and mineral collecting.

Geological facts

Commonly known as 'Fool's Gold' due to its deceptive color. Unlike real gold, it is brittle and will shatter if struck, and it leaves a greenish-black streak when rubbed on a porcelain plate.

Field identification & locations

Identify in the field by its metallic luster, golden color, and cubic crystal shapes. It is often found associated with quartz veins. Collectors look for well-defined crystal faces and lack of heavy oxidation/tarnish.

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