Gold Sheen Obsidian

Physical Properties

Hardness: 5-5.5 (Mohs scale); Color: Black with a distinctive golden chatoyancy; Luster: Vitreous; Crystal Structure: Amorphous (glassy); Cleavage: None (conchoidal fracture); Specific Gravity: 2.35-2.6

Formation & Geological History

Formed from the rapid cooling of silica-rich rhyolitic lava. The golden sheen is caused by patterns of gas bubbles or microscopic inclusions of magnetite crystals oriented along the flow layers of the lava.

Uses & Applications

Primarily used in jewelry making, ornamental carvings, lapidary art, and metaphysical collections.

Geological Facts

Obsidian was historically used for making razor-sharp surgical scalpel blades and arrowheads because it breaks into pieces with edges thinner than high-quality steel.

Field Identification & Locations

Identify in the field by its glassy texture, shell-like (conchoidal) fracture, and the flash of gold when tilted under direct light. Common in volcanic regions such as Mexico, USA (Oregon, California), and Iceland.

Identified on: 5/3/2026

Mode: Standard