Where is Mahogany Obsidian found?
Volcanic Glass (Obsidian) with iron-rich inclusions
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Open the appMahogany Obsidian occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Mahogany Obsidian
United States
Oregon (Glass Buttes, Davis Creek), California (Glass Mountain), Arizona, New Mexico, Utah, Idaho, Wyoming. These locations are known for significant obsidian deposits, including varieties with iron inclusions.
Mexico
Various volcanic regions, particularly in areas with rhyolitic volcanism.
South America
Andean regions with active or recent volcanism, such as Peru, Ecuador, and Chile.
Other Volcanic Regions
Anywhere felsic volcanic activity has occurred and conditions for rapid cooling were met, including parts of Europe (e.g., Italy, Greece), Asia (e.g., Japan, Indonesia), and Africa.
Collecting tips
- Look in Volcanic Areas. Focus on regions with recent or geologically young rhyolitic volcanic activity. Obsidian often occurs in lava flows, domes, and sometimes as nodules in volcanic ash beds.
- Identify Glassy Texture. Obsidian is easily recognizable by its distinct glassy luster and sharp, conchoidal fracture. Look for pieces that break with curved, shell-like surfaces.
- Observe Color and Pattern. Specifically for Mahogany Obsidian, look for the characteristic reddish-brown streaks or patches within the dark glass. These patterns can be quite striking.
- Safety Precautions. Obsidian breaks with extremely sharp edges, comparable to surgical scalpels. Always handle with care, preferably with gloves, to avoid cuts. When collecting, wear sturdy footwear and eye protection. Be aware of local regulations regarding mineral collecting.
Quick Check
- Color:
- Black to dark brown with reddish-brown swirls/patches.
- Luster:
- Vitreous (glassy).
- Streak:
- White (due to its amorphous nature and high silica content, though typically not practical to streak due to hardness and sharpness).
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