mineral
Pyrite-bearing rock, possibly pyrite schist or sulfide ore
Pyrite (iron disulfide, FeS₂), likely intergrown with dark metamorphic host minerals
AI-generated identification · may be incorrectBrassy metallic sparkles, granular texture, and dark gray matrix are visible; pyrite has Mohs hardness 6–6.5, cubic crystal structure, metallic luster, and no prominent cleavage. The specimen appears weathered and compact, but exact composition requires testing.
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Physical properties
Brassy metallic sparkles, granular texture, and dark gray matrix are visible; pyrite has Mohs hardness 6–6.5, cubic crystal structure, metallic luster, and no prominent cleavage. The specimen appears weathered and compact, but exact composition requires testing.
Formation & geological history
Pyrite forms in hydrothermal veins, sedimentary sulfide deposits, and metamorphic rocks through sulfur-rich chemical reactions. Its age depends on the host formation and cannot be determined from the image.
Uses & applications
Collected as a mineral specimen and used industrially for sulfuric-acid production and historically as an iron source; generally unsuitable for jewelry because it tarnishes and can oxidize.
Geological facts
Often called “fool’s gold,” pyrite is usually harder and more brittle than gold, with a dark green-black streak rather than a yellow streak.
Field identification & locations
Identify with a brass-yellow metallic color, cubic grains, high density, and a dark streak; a streak test, hardness test, and specific-gravity measurement would distinguish it from chalcopyrite or gold. Common in hydrothermal veins and sulfide-rich sedimentary or metamorphic deposits worldwide.
