mineral
Gold (10K Alloy)
Aurum (Au) with alloying metals (Cu, Ag, Zn)
AI-generated identification · may be incorrectHardness: 2.5–3 (pure) to ~3.5-4 (10k alloy); Color: Yellow; Luster: Metallic; Crystal Structure: Isometric; Specific Gravity: ~11.0-11.5 for 10k
- Hardness
- 2
- Color
- Yellow
- Luster
- Metallic
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Physical properties
Hardness: 2.5–3 (pure) to ~3.5-4 (10k alloy); Color: Yellow; Luster: Metallic; Crystal Structure: Isometric; Specific Gravity: ~11.0-11.5 for 10k
Formation & geological history
Native gold forms in hydrothermal quartz veins or placer deposits. The specimen shown is a processed 10-karat alloy (41.7% gold) manufactured for jewelry components like earring backs.
Uses & applications
Primary use in jewelry manufacturing (earring findings), dentistry, and electronic connectors due to corrosion resistance.
Geological facts
The label '10K' indicates that the item consists of 10 parts gold and 14 parts other metals. Pure gold is too soft for functional jewelry parts like screw-back earrings, so it is alloyed for durability.
Field identification & locations
Identify by '10K' or '417' stamps on the metal. It is highly resistant to tarnish compared to base metals. Found globally in lode deposits (California, South Africa, Australia) before refining.
