mineral
Gold Ore
Native Gold in Quartz (Au)
Hardness: 2.5-3 (Gold) / 7 (Quartz Matrix); Color: Metallic yellow to golden-brown; Luster: Metallic; Crystal system: Isometric; Cleavage: None; Specific gravity: 19.3 (pure)
- Hardness
- 2
- Color
- Metallic yellow to golden-brown
- Luster
- Metallic
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Physical properties
Hardness: 2.5-3 (Gold) / 7 (Quartz Matrix); Color: Metallic yellow to golden-brown; Luster: Metallic; Crystal system: Isometric; Cleavage: None; Specific gravity: 19.3 (pure)
Formation & geological history
Formed from hydrothermal fluids circulating through fractures in the Earth's crust, often associated with volcanic activity or tectonic mountain building during various geological epochs.
Uses & applications
Primary source for commercial gold production; used in bullion, jewelry, electronics, and medicine. High value for specimen collectors.
Geological facts
Gold is incredibly ductile; a single ounce can be beaten into a sheet covering 100 square feet. This specimen appears to be 'lode gold' still embedded in its host rock.
Field identification & locations
Identify by its high density (weight), metallic luster that doesn't tarnish, and malleability (it will dent rather than shatter). Found in quartz veins or as 'placer' deposits in stream beds.
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