Rock Identifier
Gold Ore (in Quartz/Sulfide matrix) (Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)) — mineral
mineral

Gold Ore (in Quartz/Sulfide matrix)

Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)

Hardness: 2.5-3 (Gold) vs 7 (Quartz); Color: Yellow/Gold flecks in milky to rusty-orange quartz; Luster: Metallic (gold) to Vitreous (quartz); Crystal Structure: Isometric (Gold), Hexagonal (Quartz)

Hardness
2
Color
Yellow/Gold flecks in milky to rusty-orange quartz
Luster
Metallic (gold) to Vitreous (quartz)
Identified More mineral →

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Physical properties

Hardness: 2.5-3 (Gold) vs 7 (Quartz); Color: Yellow/Gold flecks in milky to rusty-orange quartz; Luster: Metallic (gold) to Vitreous (quartz); Crystal Structure: Isometric (Gold), Hexagonal (Quartz)

Formation & geological history

Formed via hydrothermal processes where hot, mineral-rich fluids circulate through fractures in country rock, often during orogenic (mountain-building) events. Typically found in Precambrian to Tertiary aged deposits.

Uses & applications

Primary source for the global gold industry; used in jewelry, electronics, currency, and as high-interest geological specimens for collectors.

Geological facts

The majority of gold is found in vein deposits like this one. The 'rusty' or orange staining (limonite/goethite) is often a sign of weathered sulfides, which acts as a geological indicator for prospectors seeking gold.

Field identification & locations

Identify in the field by looking for heavy, non-tarnishing metallic yellow specks within quartz veins. Often found in mountainous regions or ancient riverbeds. Significant locations include California (USA), Witwatersrand (South Africa), and Ontario (Canada).

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