Where is Mahogany Obsidian found?
Volcanic Glass (SiO2 with iron inclusions)
Got a photo? Identify rocks instantly with the Rockby app
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
Significant deposits are found in Oregon (e.g., Glass Buttes), California, Arizona, New Mexico, and Utah.
Mexico
Various volcanic regions throughout Mexico yield Mahogany Obsidian.
Armenia
Known for its historical and contemporary obsidian sources, including varieties similar to Mahogany Obsidian.
Japan
Volcanic regions produce various types of obsidian.
Iceland
Active volcanic areas are sources of obsidian.
Collecting tips
- Look in Volcanic Areas. Search near recent (geologically speaking) volcanic flows, domes, and ash deposits. Obsidian often occurs as nodules, flow bands, or larger masses.
- Identify Glassy Luster. Obsidian has a distinct glassy sheen. Look for dark, smooth, shiny rocks that break with sharp, curved edges.
- Check for Reddish Inclusions. Specifically for Mahogany Obsidian, look for the characteristic reddish-brown streaks or patches within the dark glass. This distinguishes it from plain black obsidian.
- Safety Precautions. Obsidian breaks with extremely sharp edges. Handle with care, and consider wearing gloves and eye protection when collecting or breaking samples. Avoid inhaling obsidian dust if cutting or grinding, as it contains fine silica particles which can cause silicosis.
Quick Check
- Color:
- Dark brown to black with reddish-brown patches
- Luster:
- Vitreous (glassy)
- Streak:
- White (though typically not performed on glass due to hardness)
Explore Mahogany Obsidian
Identify rocks anywhere
Free on iOS, Android, and Web. Photo identification, full database, and your personal collection.