mineral
Native gold in quartz (probable)
Gold (Au), with quartz (SiO₂) matrix
AI-generated identification · may be incorrectMetallic yellow, highly reflective grains or nugget-like masses in a gray-white matrix; gold is very soft (Mohs 2.5–3), malleable, and has a high specific gravity (~19.3), while quartz is Mohs 7 with vitreous luster. The image is too small to confirm gold versus pyrite or chalcopyrite.
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Physical properties
Metallic yellow, highly reflective grains or nugget-like masses in a gray-white matrix; gold is very soft (Mohs 2.5–3), malleable, and has a high specific gravity (~19.3), while quartz is Mohs 7 with vitreous luster. The image is too small to confirm gold versus pyrite or chalcopyrite.
Formation & geological history
Native gold commonly forms in hydrothermal quartz veins when mineral-rich fluids deposit metals in fractures, often during mountain-building; deposits range from Precambrian to recent. Quartz is the principal gangue mineral.
Uses & applications
Gold is used in jewelry, electronics, dentistry, and investment; quartz specimens are collected and sometimes used decoratively. Value depends overwhelmingly on verified gold content and specimen aesthetics.
Geological facts
Gold leaves a yellow streak and bends or smears under pressure; pyrite is brittle, darker/brassy, and leaves a greenish-black streak. Acid and hardness tests should be performed cautiously and professionally.
Field identification & locations
Common sources include Australia, California, Alaska, Canada, Ghana, and the western United States. A jeweler, assay, specific-gravity test, or XRF analysis is needed for reliable identification.
