mineral
Gold in Quartz Matrix
Gold (Au) embedded in Quartz (SiO2)
Gold has a Mohs hardness of 2.5 to 3, rich yellow color, metallic luster, and high specific gravity (approx. 19.3). Quartz has a Mohs hardness of 7, vitreous luster, and conchoidal fracture.
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Physical properties
Gold has a Mohs hardness of 2.5 to 3, rich yellow color, metallic luster, and high specific gravity (approx. 19.3). Quartz has a Mohs hardness of 7, vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through hydrothermal processes where gold-bearing fluids circulate through fractures in the Earth's crust, precipitating gold and quartz into veins.
Uses & applications
Used primarily in jewelry, investment, electronics, and monetary reserves.
Geological facts
Gold is extremely malleable and ductile; a single ounce can be drawn into a wire 50 miles long. It does not tarnish or corrode over time.
Field identification & locations
Identified by its high density, characteristic metallic yellow color that does not streak or rub off easily, and association with milky white quartz veins. Found worldwide, notably in Australia, South Africa, and the United States (California, Alaska).
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