Gold Nugget

Physical Properties

Hardness: 2.5–3 on Mohs scale; Color: Golden yellow to brassy yellow; Luster: Metallic; Crystal Structure: Isometric (rarely visible in nuggets); Cleavage: None; Relief: High specific gravity (19.3)

Formation & Geological History

Formed in hydrothermal quartz veins through precipitation from hot, mineral-rich fluids. Nuggets are often found in secondary alluvial (placer) deposits after being weathered out of host rock and transported by water.

Uses & Applications

Primary use in investment/currency, jewelry, electronics, and aerospace due to high conductivity and corrosion resistance. Highly valued by mineral collectors.

Geological Facts

Unlike most metals, gold is found in its native, pure form. The largest nugget ever found, the 'Welcome Stranger' in Australia, weighed over 70kg. Gold is so malleable that a single ounce can be beaten into a sheet covering 100 square feet.

Field Identification & Locations

Identify by its high density (feels very heavy for its size), extreme malleability (it will dent rather than shatter if struck), and yellow streak. Found in old riverbeds and mountain streams in regions like California, Alaska, and Australia.

Identified on: 5/5/2026

Mode: Standard