metamorphic
Gold-bearing quartz vein rock (probable pyrite-rich schist or quartzite)
Quartz (SiO₂) with iron sulfides, chiefly pyrite (FeS₂), and possible native gold
AI-generated identification · may be incorrectCoarse, irregular rock with abundant glassy quartz and brassy metallic grains; likely Mohs 6–7 for quartz and 6–6.5 for pyrite. Native gold, if present, is soft (2.5–3), malleable, and intensely yellow; pyrite is brittle and generally paler/brassy. Exact mineral identification requires testing.
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Physical properties
Coarse, irregular rock with abundant glassy quartz and brassy metallic grains; likely Mohs 6–7 for quartz and 6–6.5 for pyrite. Native gold, if present, is soft (2.5–3), malleable, and intensely yellow; pyrite is brittle and generally paler/brassy. Exact mineral identification requires testing.
Formation & geological history
Likely formed in a hydrothermal quartz vein during metamorphism, with sulfides deposited from hot, mineral-rich fluids; the Colombian Andes commonly host such gold-bearing systems. Age cannot be determined from the photograph.
Uses & applications
Quartz-rich material is used as aggregate and silica feedstock; pyrite is mainly a mineral specimen. Confirmed native gold has economic value and may be recovered by crushing, panning, or assay-guided mining.
Geological facts
The strong metallic sparkle may be pyrite (“fool’s gold”), chalcopyrite, mica, or actual gold. A photograph cannot establish gold content; an assay is essential.
Field identification & locations
Near 6.1°N, 75.4°W, gold-bearing quartz veins and sulfide-rich metamorphic rocks are geologically plausible. Gold is malleable and leaves a yellow streak; pyrite is brittle, has a dark greenish-black streak, and forms angular crystals. Do not rely on color alone.
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