mineral
Polished quartz-rich pebble, possibly gold-bearing quartz vein material
Quartz (SiO₂) with probable iron-oxide staining and metallic sulfide inclusions
AI-generated identification · may be incorrectSmooth, rounded, gray translucent body with glassy luster and scattered yellow-gold patches; quartz hardness is 7 Mohs, lacks cleavage, and has a hexagonal crystal structure. The yellow areas may be pyrite or chalcopyrite rather than native gold.
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Physical properties
Smooth, rounded, gray translucent body with glassy luster and scattered yellow-gold patches; quartz hardness is 7 Mohs, lacks cleavage, and has a hexagonal crystal structure. The yellow areas may be pyrite or chalcopyrite rather than native gold.
Formation & geological history
Likely a naturally weathered quartz vein fragment later polished or tumbled; quartz veins form from silica-rich hydrothermal fluids in fractures, commonly during igneous or metamorphic activity. Its precise geological age cannot be determined from the image.
Uses & applications
Suitable as a decorative or lapidary specimen, cabochon, or curiosity stone; quartz is widely used in glass, electronics, abrasives, and construction. Value is generally modest unless gold is confirmed.
Geological facts
Brassy metallic inclusions commonly indicate pyrite (“fool’s gold”) or chalcopyrite, both harder and more brittle-looking than native gold. A streak test, hardness test, magnification, and ideally XRF or assay are needed for identification.
Field identification & locations
Common in hydrothermal vein districts worldwide, including Nevada, California, Australia, Brazil, and Canada. Gold is malleable and leaves a yellow streak, whereas pyrite/chalcopyrite are brittle and usually leave dark green-black streaks; avoid destructive testing on valuable pieces.
