metamorphic
Pyrite-bearing rock (likely pyrite schist or pyritized shale)
Pyrite (FeS₂) in a fine-grained schistose or shale matrix
AI-generated identification · may be incorrectBrassy yellow metallic luster with glittering granular crystals; pyrite hardness is 6–6.5 Mohs, specific gravity about 5.0, and it has cubic crystal structure with poor cleavage. The dark gray-brown matrix appears fine-grained and fractured; exact rock type cannot be confirmed from the image alone.
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Physical properties
Brassy yellow metallic luster with glittering granular crystals; pyrite hardness is 6–6.5 Mohs, specific gravity about 5.0, and it has cubic crystal structure with poor cleavage. The dark gray-brown matrix appears fine-grained and fractured; exact rock type cannot be confirmed from the image alone.
Formation & geological history
Pyrite forms when iron and sulfur react in low-oxygen sedimentary or hydrothermal environments; deformation or burial may produce a schistose matrix. Formation age is indeterminate and could range from Paleozoic to recent hydrothermal settings.
Uses & applications
Collected as a mineral specimen and sometimes used historically as a sulfur source; rarely used for jewelry because it tarnishes and can oxidize. Pyrite-rich rock has limited construction value.
Geological facts
Pyrite is commonly called “fool’s gold,” but it is harder, paler, and more brittle than gold. Oxidation can produce sulfuric acid and rusty iron-staining, especially in damp conditions.
Field identification & locations
Look for metallic brassy grains, black streak, brittle fracture, and a spark when struck with steel; gold is softer and leaves a yellow streak. Common in sedimentary basins, metamorphic rocks, and hydrothermal veins worldwide.
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