metamorphic
Pyrite-bearing metamorphic rock (likely schist or quartzite)
Quartz–mica rock with disseminated pyrite; pyrite is FeS₂
AI-generated identification · may be incorrectHardness is approximately 5–7 overall; pyrite is Mohs 6–6.5. The specimen is dark gray, granular, and sparkly with metallic brassy grains, likely quartz, mica, and sulfides; cleavage is weak to variable and specific gravity is moderate to high.
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Physical properties
Hardness is approximately 5–7 overall; pyrite is Mohs 6–6.5. The specimen is dark gray, granular, and sparkly with metallic brassy grains, likely quartz, mica, and sulfides; cleavage is weak to variable and specific gravity is moderate to high.
Formation & geological history
Likely formed when shale or volcanic sediment was metamorphosed under heat and pressure, recrystallizing quartz and mica while concentrating pyrite. Its precise geological age cannot be determined from the photograph.
Uses & applications
Commonly a collector specimen; if abundant, pyrite-bearing rocks may indicate sulfide mineralization, though this small sample has no demonstrated ore value. Similar rocks can be used locally as decorative stone or aggregate.
Geological facts
Pyrite is known as “fool’s gold,” but its brassy metallic color and cubic crystals distinguish it from gold. Pyrite can weather to iron oxides and sulfuric acid, producing rusty staining.
Field identification & locations
Look for metallic brass-colored grains, gray quartz-rich matrix, and a dark streak or oxidation; pyrite is harder than a knife but may be scratched by hardened steel. Common settings include metamorphic belts and hydrothermal ore zones worldwide.
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