metamorphic
Pyrite-bearing metamorphic rock (likely pyrite schist or quartz–pyrite ore)
Pyrite (FeS₂) in a quartz–mica-rich matrix; exact host rock is uncertain from the image
AI-generated identification · may be incorrectBrassy metallic to dull gray-gold patches, granular texture, and abundant rounded or botryoidal-looking aggregates; pyrite hardness 6–6.5, cubic crystal system, no cleavage, specific gravity about 5.0. The dark matrix may contain quartz, mica, chlorite, or sulfides.
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Physical properties
Brassy metallic to dull gray-gold patches, granular texture, and abundant rounded or botryoidal-looking aggregates; pyrite hardness 6–6.5, cubic crystal system, no cleavage, specific gravity about 5.0. The dark matrix may contain quartz, mica, chlorite, or sulfides.
Formation & geological history
Likely formed when iron- and sulfur-bearing fluids or sediments were metamorphosed and pyrite crystallized in fractures or foliated rock. The specimen’s geological age cannot be determined visually and depends on its locality.
Uses & applications
Pyrite is used chiefly as a sulfur source and minor accessory in mineral collecting; quartz-rich host rock has limited construction value. Attractive specimens are sold for display.
Geological facts
Pyrite is known as “fool’s gold,” but it is harder, paler, and more brittle than native gold. Fresh surfaces may tarnish and pyrite can produce acidic drainage when oxidized.
Field identification & locations
Check for a metallic brass streak and cubic crystal faces; pyrite leaves a greenish-black to brownish-black streak, unlike gold’s yellow streak. Common worldwide in hydrothermal veins, sedimentary beds, and metamorphic rocks.
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