mineral

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Hardness: 2.5-3 for gold, 7 for quartz matrix; Color: Metallic gold yellow against dark grey/black host; Luster: Metallic (gold) to dull/greasy (ore); Crystal Structure: Isometric (gold), Trigonal (quartz); Specific Gravity: ~19.3 (pure gold).

Hardness: 2
Color: Metallic gold yellow against dark grey/black host
Luster: Metallic (gold) to dull/greasy (ore)

Identified April 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal processes where hot, mineral-rich fluids circulate through crustal fractures. Often associated with quartz veins in metamorphic or igneous terrains dating from the Precambrian to Cenozoic eras.

Uses & applications

Primary source of gold for currency, jewelry, electronics, and dentistry. High value as geological cabinet specimens for collectors.

Geological facts

Most gold is found in tiny, microscopic particles within such ore. Finding visible 'leaf' or 'wire' gold in a hand specimen significantly increases its value to collectors compared to its weight in metal alone.

Field identification & locations

Identify by the high density and malleability of the yellow metallic spots; unlike fool's gold (pyrite), it does not crumble when poked and maintains its color in shade. Found in historic mining districts like the California Mother Lode or Witwatersrand.

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