metamorphic
Pyrite-bearing metamorphic rock (probable pyrite schist)
Schist containing pyrite (FeS₂), with probable quartz and mica
AI-generated identification · may be incorrectHardness is approximately 6–6.5 for pyrite and 2–3 for mica; metallic brassy-gold patches occur in a gray, foliated matrix. Pyrite is cubic, has metallic luster, and lacks cleavage; mica commonly produces flaky foliation. Specific gravity is roughly 4.8–5.0 for pyrite-rich portions.
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Physical properties
Hardness is approximately 6–6.5 for pyrite and 2–3 for mica; metallic brassy-gold patches occur in a gray, foliated matrix. Pyrite is cubic, has metallic luster, and lacks cleavage; mica commonly produces flaky foliation. Specific gravity is roughly 4.8–5.0 for pyrite-rich portions.
Formation & geological history
Likely formed when sulfur- and iron-bearing sediments were metamorphosed under elevated pressure and temperature, concentrating pyrite along foliation. Exact age and locality cannot be determined from the photograph.
Uses & applications
Primarily a collector specimen; pyrite may be mined for sulfur and historically for iron, while schist is sometimes used as decorative stone but is generally unsuitable for high-strength construction.
Geological facts
Pyrite is commonly called “fool’s gold,” but its brassy color and metallic appearance can resemble gold. Unlike gold, pyrite is brittle, may show cubic crystal faces, and produces a dark streak rather than a yellow one.
Field identification & locations
Common in metamorphic belts and hydrothermal ore zones worldwide. Confirm with a streak test, hardness test, and inspection for cubic crystals; avoid prolonged moisture because pyrite can oxidize and form acidic efflorescence.
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