mineral

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2) and Slate/Shale

AI-generated identification · may be incorrect

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

Identified May 19, 2026More mineral →

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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.