mineral
Gold-bearing quartz or iron-stained quartzite
Quartz (SiO₂), possibly with native gold and iron oxides
AI-generated identification · may be incorrectHardness about 7 (quartz); typically tan to rusty brown, granular, and vitreous to earthy. The bright yellow metallic-looking flecks may be native gold, pyrite, or mica; identification requires testing, since color alone is insufficient.
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Physical properties
Hardness about 7 (quartz); typically tan to rusty brown, granular, and vitreous to earthy. The bright yellow metallic-looking flecks may be native gold, pyrite, or mica; identification requires testing, since color alone is insufficient.
Formation & geological history
Likely hydrothermal quartz vein material weathered in an oxidizing environment; associated gold deposits can range from ancient Precambrian to younger Phanerozoic systems. The specimen appears natural and unpolished.
Uses & applications
Gold-bearing quartz is collected, assayed, and occasionally processed for gold; ordinary quartz-rich rock has little industrial value as a small specimen. Confirmed visible gold can substantially increase value.
Geological facts
Native gold is very soft (Mohs 2.5–3), malleable, and does not tarnish; pyrite is harder (6–6.5), brittle, and often forms sharper crystals. A specific gravity or professional assay is needed to distinguish them reliably.
Field identification & locations
Common in hydrothermal veins and placer-source regions worldwide, including western North America, Australia, and South Africa. Gold smears or dents under a steel point, while pyrite and mica crumble or scratch; avoid destructive testing without permission.
