mineral
Weathered gold-bearing quartz/ironstone (possible gold nugget)
Native gold (Au), if metallic gold is present, in quartz–iron-oxide matrix
AI-generated identification · may be incorrectYellow-brown, dull to slightly metallic surface with granular texture; likely quartz and iron oxides. Gold is Mohs 2.5–3 and malleable, whereas quartz is Mohs 7; apparent color alone cannot confirm gold.
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Physical properties
Yellow-brown, dull to slightly metallic surface with granular texture; likely quartz and iron oxides. Gold is Mohs 2.5–3 and malleable, whereas quartz is Mohs 7; apparent color alone cannot confirm gold.
Formation & geological history
May form in hydrothermal quartz veins, with weathering releasing resistant native-gold pieces; host rocks can be Precambrian to younger depending on locality. The image is insufficient to determine age or composition confidently.
Uses & applications
Gold has value in jewelry, electronics, and bullion; quartz-rich specimens are mainly collectible. Ironstone itself is common and generally low-value.
Geological facts
A true gold nugget should feel unusually dense, leave a yellow streak when scratched on unglazed porcelain, and deform rather than crumble under pressure; these tests can damage a specimen.
Field identification & locations
Possible indicators include exceptional heft, persistent yellow color in fresh fractures, and malleability, but brass-colored sulfides and iron-stained rocks can look similar. Confirm with specific-gravity testing, streak, and professional assay; common goldfields include Australia, Alaska, California, and the Witwatersrand.
