mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2)
Mohs hardness: Gold 2.5-3, Quartz 7. Color: Yellowish-gold metallic band/flecks in whitish to pinkish-tan quartz matrix. Luster: Metallic for gold, vitreous to dull for quartz matrix. Specific gravity: Gold ~19.3, Quartz ~2.65.
- Hardness
- Gold 2
- Luster
- Metallic for gold, vitreous to dull for quartz matrix
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Physical properties
Mohs hardness: Gold 2.5-3, Quartz 7. Color: Yellowish-gold metallic band/flecks in whitish to pinkish-tan quartz matrix. Luster: Metallic for gold, vitreous to dull for quartz matrix. Specific gravity: Gold ~19.3, Quartz ~2.65.
Formation & geological history
Hydrothermal vein deposits formed when hot, mineral-rich fluid flows through fractures in host rocks, precipitating gold and quartz along vein walls.
Uses & applications
Gold extraction, lapidary arts, jewelry components, cabochons, and mineral specimen collecting.
Geological facts
Native gold usually contains a small percentage of silver (forming an alloy called electrum). Gold-bearing quartz veins were the primary source for major historical gold rushes, such as the California Gold Rush of 1849.
Field identification & locations
Identified by the distinct metallic golden luster that does not tarnish or flake off, embedded within a hard quartz matrix. Found worldwide in gold-bearing mining districts like California, Alaska, Australia, and South Africa.
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