mineral
Gold
Gold (Au)
Hardness: 2.5-3 on Mohs scale; Color: Golden yellow, sometimes reddish or whitish; Luster: Metallic; Crystal Structure: Isometric; Cleavage: None (exhibits hackly fracture); Specific Gravity: 19.3 (very heavy)
- Hardness
- 2
- Color
- Golden yellow, sometimes reddish or whitish
- Luster
- Metallic
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Physical properties
Hardness: 2.5-3 on Mohs scale; Color: Golden yellow, sometimes reddish or whitish; Luster: Metallic; Crystal Structure: Isometric; Cleavage: None (exhibits hackly fracture); Specific Gravity: 19.3 (very heavy)
Formation & geological history
Formed in hydrothermal veins associated with quartz, or in placer deposits through the weathering and erosion of primary veins. Geological age varies widely depending on the deposit.
Uses & applications
Used in jewelry, investment bullion, electronics, and dentistry.
Geological facts
Gold is extremely ductile and malleable; a single ounce can be drawn into a wire 50 miles long. It does not tarnish or corrode over time.
Field identification & locations
Can be identified in the field by its high density, golden color that does not fade in acid, and malleable nature rather than crumbling when struck. Found globally, notably in South Africa, Australia, the USA, and Canada.
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