mineral

Gold (in Opaque Matrix/Jewelry)

Native Gold (Au)

Hardness: 2.5–3.0 on Mohs scale; Color: Golden yellow; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: None; Specific Gravity: 19.3 (pure gold).

Hardness: 2
Color: Golden yellow
Luster: Metallic

Identified March 5, 2026More mineral →

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Physical properties

Hardness: 2.5–3.0 on Mohs scale; Color: Golden yellow; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: None; Specific Gravity: 19.3 (pure gold).

Formation & geological history

Formed through hydrothermal processes where hot, mineral-rich fluids circulate through crustal fractures, often in association with quartz veins. It can be found in various geological ages from Precambrian to recent.

Uses & applications

Primary use in jewelry, investment (bullion), electronics (due to high conductivity), and dentistry.

Geological facts

Gold is chemically inert and does not tarnish or oxidize. The specimen shown is a religious 'Miraculous Medal' featuring an image of the Virgin Mary, likely gold-plated or cast gold set in a resin or glass-covered bezel.

Field identification & locations

Identified in the field by its high density, extreme malleability (it bends rather than breaks), and persistent yellow streak. Commonly found in lode deposits or as 'placer' gold in stream beds.