mineral
Gold-bearing quartz specimen
Native gold (Au) in quartz, possibly with iron sulfides
AI-generated identification · may be incorrectIrregular pale quartz matrix with brassy yellow metallic patches and dark staining; quartz hardness ~7, vitreous luster, while native gold is Mohs 2.5–3, malleable, and metallic. The image is too small to confirm whether the yellow material is gold or pyrite.
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Physical properties
Irregular pale quartz matrix with brassy yellow metallic patches and dark staining; quartz hardness ~7, vitreous luster, while native gold is Mohs 2.5–3, malleable, and metallic. The image is too small to confirm whether the yellow material is gold or pyrite.
Formation & geological history
Likely formed in a hydrothermal quartz vein when mineral-rich fluids deposited silica and sulfides or native gold in fractures, commonly during or after mountain-building. Exact age and locality cannot be determined from the photograph.
Uses & applications
Gold-bearing quartz is collected as an ore specimen and, if assays confirm gold, may have economic value; quartz itself is widely used in glass, electronics, and construction. Attractive pieces may be sold as mineral specimens.
Geological facts
Native gold remains yellow in shadow and can be dented or cut, whereas pyrite is harder, brittle, and often forms crystalline faces. A streak, density, hardness, and assay test are needed for reliable identification.
Field identification & locations
Common in hydrothermal vein districts worldwide, including California, Nevada, Western Australia, Canada, and South Africa. Test with a specific-gravity measurement or professional assay; avoid destructive testing on a potentially valuable specimen.
