metamorphic
Pyrite-rich rock (likely pyrite-bearing schist)
Pyrite (FeS₂) in a foliated metamorphic matrix; exact host rock cannot be confirmed from the image
AI-generated identification · may be incorrectBrassy metallic sparkles in a gray-green, layered, fractured matrix. Pyrite has Mohs hardness 6–6.5 and cubic crystals; the host rock’s hardness and composition are uncertain.
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Physical properties
Brassy metallic sparkles in a gray-green, layered, fractured matrix. Pyrite has Mohs hardness 6–6.5 and cubic crystals; the host rock’s hardness and composition are uncertain.
Formation & geological history
Pyrite forms in sulfur- and iron-rich environments, including sedimentary deposits and hydrothermal veins; a schistose host may form during metamorphism. Age depends on the deposit and cannot be determined visually.
Uses & applications
Pyrite-bearing rocks are mainly collected as specimens; pyrite has limited industrial use as an iron and sulfur source, while schist is sometimes used as decorative stone.
Geological facts
Pyrite is known as “fool’s gold,” but its brittle nature and lack of gold’s malleability distinguish it from native gold.
Field identification & locations
Look for brassy metallic grains, brittle fractures, and possible cubic faces; pyrite occurs worldwide in sedimentary, metamorphic, and hydrothermal settings. A closer view or simple hardness/streak tests would help identify the host rock.
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