mineral
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
Hardness: 6-6.5 on the Mohs scale. Color: Brass-yellow to metallic golden specks embedded in a dark grey-brown matrix. Luster: Metallic. Crystal structure: Isometric/cubic. Cleavage: Poor/indistinct. Specific gravity: ~5.0.
- Hardness
- 6-6
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 on the Mohs scale. Color: Brass-yellow to metallic golden specks embedded in a dark grey-brown matrix. Luster: Metallic. Crystal structure: Isometric/cubic. Cleavage: Poor/indistinct. Specific gravity: ~5.0.
Formation & geological history
Forms in hydrothermal veins, metamorphic rocks, and sedimentary environments through the crystallization of iron and sulfur rich fluids.
Uses & applications
Historically used as an ore of sulfur and for making sulfuric acid. Popular as an ornamental mineral specimen and educational stone.
Geological facts
Nicknamed 'Fool's Gold' due to its superficial resemblance to gold, though it is much harder, brittle, and leaves a greenish-black streak unlike soft, malleable gold.
Field identification & locations
Identified by brassy golden metallic flecks within a dark host rock, high density, and brittle nature. Found globally in mining regions such as Peru, Spain, and the USA.
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