Gold Nugget
Native Gold · Precious Metal / Mineral Specimen
Crystal System
Cubic (Isometric); typically occurs as irregular nuggets, grains, or dendritic masses rather than distinct crystals.
Mineral Group
Native Elements
Chemical Formula
Au (may contain trace Ag, Cu, Fe)
Formation Process
Primarily Hydrothermal (crystallizing in quartz veins from hot, mineral-rich fluids) or Sedimentary/Secondary (placer deposits where it is concentrated by water erosion).
About This Crystal
An irregular, rounded, or flattened nugget of metallic yellow color. Features a distinct metallic luster, opaque transparency, and a pitted, weathered surface texture typical of water-worn specimens.
Physical Characteristics
Color: Golden yellow; Streak: Golden yellow; Cleavage: None; Fracture: Hackly; Specific Gravity: 15.5–19.3; Tenacity: Highly malleable and ductile; Fluorescence: None.
Optical Properties
Opaque; Metallic luster; Low reflectivity compared to silver; No birefringence or pleochroism due to isometric nature.
Hardness & Durability
Origin Region
Prominent sources include Australia, Alaska, California (USA), Canada, and South Africa; found in alluvial placer deposits or hydrothermal quartz veins.
Hardness & Durability
Mohs Hardness: 2.5–3.0. Very soft and easily scratched or dented, but chemically extremely stable and resistant to most acids/tarnish.
Care & Maintenance
Hardness is low so avoid contact with abrasive materials; clean with warm soapy water and a soft cloth; avoid aqua regia (acid mixture). Store separately to prevent scratching.
Rarity & Value
Rare. Value is determined by weight (spot price of gold) plus a significant premium for natural nugget geometry and aesthetic appeal; treatments are rare but may include cleaning with hydrofluoric acid to remove quartz.
Special Characteristics
Exceptional density; high electrical and thermal conductivity; extreme malleability (the specimen can be hammered flat without breaking).
Lore & History
Historically used as currency and the ultimate symbol of wealth/power across all major civilizations. Traditionally associated with solar energy, the heart chakra, and themes of abundance and vitality.