metamorphic
Pyrite-bearing metamorphic rock (likely schist or gneiss)
Pyrite (FeS₂) in a quartz–mica-rich host rock
AI-generated identification · may be incorrectMetallic brassy-gold pyrite grains occur with silvery-gray mica and pale quartz/feldspar; pyrite is cubic, hardness 6–6.5, metallic luster, and specific gravity about 5.0. The foliated, sparkly texture suggests schist or gneiss rather than a single mineral specimen.
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Physical properties
Metallic brassy-gold pyrite grains occur with silvery-gray mica and pale quartz/feldspar; pyrite is cubic, hardness 6–6.5, metallic luster, and specific gravity about 5.0. The foliated, sparkly texture suggests schist or gneiss rather than a single mineral specimen.
Formation & geological history
Likely formed when sedimentary rock was metamorphosed under elevated pressure and temperature, with pyrite crystallizing from sulfur- and iron-bearing fluids or during diagenesis; age cannot be determined from the photograph. Common in metamorphic belts and hydrothermal zones.
Uses & applications
Primarily a collector specimen; pyrite is also an ore of sulfur and historically a minor iron source, while the host rock may be used decoratively if sound.
Geological facts
Pyrite’s brassy color and metallic luster can resemble gold, but pyrite is harder, more brittle, and commonly forms sharp cubic crystals. Weathering may produce iron oxides and sulfuric acidity.
Field identification & locations
Look for brass-yellow, brittle grains that leave a dark streak and may show cubic faces, contrasting with platy reflective mica and pale quartz. Common localities include the Appalachians, New England, the Alps, and many hydrothermal districts.
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