metamorphic
Pyrite-bearing metamorphic rock, likely pyrite schist or pyrite-rich slate
Pyrite (FeS₂) in a foliated quartz–mica-rich host
AI-generated identification · may be incorrectBrassy yellow metallic grains with a dark gray, fine-grained matrix; pyrite hardness 6–6.5, cubic crystal system, metallic luster, and no cleavage. The specimen appears dense and granular, though the host rock’s hardness and cleavage vary with its mineral content.
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Physical properties
Brassy yellow metallic grains with a dark gray, fine-grained matrix; pyrite hardness 6–6.5, cubic crystal system, metallic luster, and no cleavage. The specimen appears dense and granular, though the host rock’s hardness and cleavage vary with its mineral content.
Formation & geological history
Likely formed when sulfur- and iron-bearing sediments underwent metamorphism, concentrating pyrite during burial and deformation; age depends on locality and may range from Precambrian to Paleozoic. Common in hydrothermal veins and metamorphosed shale.
Uses & applications
Pyrite is used chiefly as a source of sulfur and historically for sulfuric acid production; attractive specimens are collected, while the host rock has little construction use.
Geological facts
Known as “fool’s gold,” pyrite is generally paler and more brittle than gold and commonly forms cubes or pyritohedra. It can oxidize in moist air, producing acidic iron-sulfate stains.
Field identification & locations
Identify by its metallic brass color, high hardness, brittleness, and lack of gold’s malleability; a streak test is dark greenish-black. Common localities include Spain, Peru, Italy, China, and many sulfide-mining districts.
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