igneous
Gold Sheen Obsidian
Volcanic Glass (SiO2 + impurities)
Hardness: 5-5.5; Color: Black with golden chatoyancy; Luster: Vitreous; Crystal Structure: Amorphous; Cleavage: None/Conchoidal fracture.
- Hardness
- 5-5
- Color
- Black with golden chatoyancy
- Luster
- Vitreous
Identified More igneous →
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Physical properties
Hardness: 5-5.5; Color: Black with golden chatoyancy; Luster: Vitreous; Crystal Structure: Amorphous; Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed from the rapid cooling of silica-rich rhyolitic lava. The gold sheen is caused by microscopic bubbles of gas trapped in the cooling glass, aligned along flow layers.
Uses & applications
Used in jewelry, decorative carvings, cabochons, and as a focus for meditation or metaphysical practices.
Geological facts
Obsidian is not a mineral because it lacks a crystalline structure; it is often called a mineraloid. Gold sheen obsidian is particularly prized for its reflective 'shimmer' when held under direct light.
Field identification & locations
Identify by rotating under light to see the golden flash. Often found in volcanic areas such as Mexico, the United States (Oregon/California), and Iceland.
