mineral
Pyrite with Vesicular Matrix
Iron Disulfide (FeS2)
Hardness of 6-6.5 on the Mohs scale, metallic to sub-metallic luster, brass-yellow to dull brownish-grey color, cubic crystal habit, brittle tenacity.
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Physical properties
Hardness of 6-6.5 on the Mohs scale, metallic to sub-metallic luster, brass-yellow to dull brownish-grey color, cubic crystal habit, brittle tenacity.
Formation & geological history
Formed in hydrothermal veins, sedimentary rocks under reducing conditions, and metamorphism. Iron disulfide precipitates alongside silicates or within volcanic host matrix.
Uses & applications
Historically used as a source of sulfur and sulfuric acid. Today, it is popular among mineral collectors, used in ornamental items, and researched for use in photovoltaics.
Geological facts
Often called 'Fool's Gold' due to its metallic luster and yellow-brass hue, though this dark/weathered specimen shows more tarnished surfaces alongside fine crystal aggregates.
Field identification & locations
Identified by its brassy to greyish metallic glint, high density relative to typical silicates, and dark streak (greenish-black). Found worldwide in diverse geological formations.
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