mineral
Quartz-rich gold-brown mineral specimen, possibly iron-stained quartz
Quartz (SiO₂), likely with limonite/goethite staining and minor sulfide or mica inclusions
AI-generated identification · may be incorrectTranslucent white to honey-gold, vitreous luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The rough, granular surface and brown-yellow coating are consistent with iron oxides, though the photo cannot confirm native gold.
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Physical properties
Translucent white to honey-gold, vitreous luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The rough, granular surface and brown-yellow coating are consistent with iron oxides, though the photo cannot confirm native gold.
Formation & geological history
Likely formed in a hydrothermal quartz vein, where silica-rich fluids deposited quartz and later oxidation produced limonite/goethite staining; age depends on its host deposit and cannot be determined visually.
Uses & applications
Common quartz is used in glass, electronics, abrasives, and construction; attractive specimens are collected. If actual gold is present, it may have assay value, but appearance alone is insufficient.
Geological facts
Gold-colored surfaces may be iron oxides, mica, or weathered sulfides rather than gold. Gold is malleable and leaves a yellow streak, whereas quartz scratches glass and breaks rather than bending.
Field identification & locations
Common in hydrothermal veins and mining districts worldwide. Test with a steel file or glass, inspect with a loupe, and use an assay or density test before claiming gold.
