mineral
Pyrite-bearing rock (likely pyrite-rich schist or quartzite)
Pyrite, FeS₂, disseminated in a metamorphic host rock
AI-generated identification · may be incorrectBrassy yellow metallic luster with granular, glittering crystals; pyrite hardness 6–6.5, cubic crystal system, no obvious cleavage, and specific gravity about 5.0. The dark, foliated-looking matrix suggests schist or altered quartz-rich rock.
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Physical properties
Brassy yellow metallic luster with granular, glittering crystals; pyrite hardness 6–6.5, cubic crystal system, no obvious cleavage, and specific gravity about 5.0. The dark, foliated-looking matrix suggests schist or altered quartz-rich rock.
Formation & geological history
Pyrite formed when iron and sulfur combined in low-oxygen hydrothermal or sedimentary environments, later concentrated during metamorphism; the host may be Paleozoic or older depending on locality. Exact age and rock identity require testing.
Uses & applications
Used historically as a sulfur source and rarely as an ore for gold or other metals; attractive specimens are collected, but it is not generally used as a gemstone because it tarnishes and can decompose.
Geological facts
Often called “fool’s gold,” though its brassy color and metallic sparkle can resemble gold. Pyrite may produce sulfuric acid through oxidation, especially when exposed to moisture.
Field identification & locations
Identify by its metallic brassy color, high hardness, dark streak, and brittle fracture; gold is softer, malleable, and leaves a yellow streak. Common in hydrothermal veins, coal beds, shales, and metamorphic rocks worldwide.
