Mahogany Obsidian

Physical Properties

Hardness: 5.0–5.5 on the Mohs scale; Color: Reddish-brown (mahogany) and black mottled patterns; Luster: Vitreous (glassy); Crystal Structure: Amorphous; Cleavage: None (conchoidal fracture); Specific Gravity: 2.35–2.6

Formation & Geological History

Formed when felsic lava cools rapidly with minimal crystal growth. The reddish color comes from inclusions of Magnetite or Hematite (iron oxides) during the cooling process. Commonly found in areas with geologically recent volcanic activity.

Uses & Applications

Used primarily for lapidary work, jewelry (beads, cabochons), ornamental carvings (like the tower shown), and by collectors or practitioners of metaphysical healing.

Geological Facts

Despite being called a rock, it is technically a 'mineraloid' because it lacks a crystal structure. Mahogany Obsidian is particularly known for having 'softer' energy in metaphysical circles compared to Black Obsidian.

Field Identification & Locations

Identify by its distinctive brick-red and black swirling patterns and its sharp, shell-like (conchoidal) fractures if chipped. Common locations include the Western USA (Oregon, California), Mexico, and Japan.

Identified on: 4/29/2026

Mode: Standard