mineral
Gold-bearing quartz vein rock
Quartz (SiO₂) with probable native gold and iron-oxide/sulfide minerals
AI-generated identification · may be incorrectWhite to translucent quartz occurs with dark gray matrix and brassy yellow-brown metallic patches. Quartz hardness is 7, vitreous luster, and no cleavage; visible yellow material may be gold, pyrite, chalcopyrite, or iron staining, which cannot be confirmed visually.
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Physical properties
White to translucent quartz occurs with dark gray matrix and brassy yellow-brown metallic patches. Quartz hardness is 7, vitreous luster, and no cleavage; visible yellow material may be gold, pyrite, chalcopyrite, or iron staining, which cannot be confirmed visually.
Formation & geological history
Likely hydrothermal vein material formed when mineral-rich fluids deposited quartz and metallic minerals in fractures, commonly during Precambrian to Phanerozoic mountain-building events. Exact age and locality require provenance or laboratory analysis.
Uses & applications
Gold-bearing quartz is collected as an ore specimen and occasionally used for jewelry or display; quartz itself is widely used in glass, electronics, and construction aggregate. Economic value depends almost entirely on assayed gold content.
Geological facts
Native gold is malleable and usually bright yellow, while pyrite is harder, brittle, and commonly brassy with cubic crystals. A specific-gravity test, streak test, acid testing, and especially fire assay or XRF are needed for reliable identification.
Field identification & locations
Common in hydrothermal gold districts worldwide, including Australia, California, Nevada, Canada, and South Africa. Look for metallic yellow flecks in fractures, but do not assume gold from color alone; avoid damaging the specimen before testing.
