mineral

Gold in Quartz Matrix

Native Gold (Au) in Quartz (SiO2)

Hardness: 2.5-3 for Gold, 7 for Quartz; Color: Metallic yellow gold flecks in grey/greenish stone; Luster: Metallic gold, vitreous matrix; Crystal structure: Isometric (gold), Trigonal (quartz); Specific gravity: ~19 (gold).

Hardness: 2
Color: Metallic yellow gold flecks in grey/greenish stone
Luster: Metallic gold, vitreous matrix

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Hydrothermal formation where hot, mineral-rich fluids circulate through fractures in rocks, typically associated with orogenic belts and volcanic activity. Age varies from Archean to Tertiary.

Uses & applications

Primary source of gold for investment, jewelry, and electronics; matrix specimens are valued for geological collection and educational purposes.

Geological facts

Unlike fool's gold (pyrite), genuine gold is malleable and won't shatter when struck. It often occurs in 'lode' deposits within quartz veins.

Field identification & locations

Identify by the distinct buttery yellow color that does not change at different angles; gold is much heavier than surrounding rock. Commonly found in California (USA), Australia, and South Africa.

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Mineral/Rock

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Metamorphic Rock

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mineral