mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
Hardness: 2.5-3 (Gold) / 7 (Quartz); Color: Metallic golden yellow on dark grey/black; Luster: Metallic; Crystal Structure: Isometric (Gold); Cleavage: None; Specific Gravity: 19.3 (Gold)
- Hardness
- 2
- Color
- Metallic golden yellow on dark grey/black
- Luster
- Metallic
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Physical properties
Hardness: 2.5-3 (Gold) / 7 (Quartz); Color: Metallic golden yellow on dark grey/black; Luster: Metallic; Crystal Structure: Isometric (Gold); Cleavage: None; Specific Gravity: 19.3 (Gold)
Formation & geological history
Formed via hydrothermal veins where mineral-rich hot fluids deposit metals into rock fractures. These deposits are often found in metamorphic belts or associated with igneous intrusions.
Uses & applications
Primary source of gold for currency, investment, high-end jewelry, and electronics due to its conductivity.
Geological facts
Most gold found in nature is in the form of 'native gold,' meaning it is not chemically bonded to other elements. This specimen shows gold embedded in a dark host rock, likely a silicified slate or shale.
Field identification & locations
Identify by its high density and malleability (it will dent, not shatter). Look for heavy black sands or quartz outcrops in known gold-bearing regions like California, Alaska, or Australia.
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