This Specimen has been sold.
Huge, 6.75" Polished Mahogany Obsidian Sphere - Mexico
This is a huge, 6.75" wide mahogany obsidian sphere, collected from Mexico. This obsidian specimen has been polished, revealing the swirls and streaks of red/orange color that give this form of obsidian its name.
Mahogany obsidian is a natural glass formed during volcanic eruptions when lava cools very quickly. Because the speed at which the lava cools no crystal structures can form. The red streaks in the normally jet-black obsidian are due to the inclusion of hematite or other iron-based minerals. This stone can be found worldwide, though the main source is Mexico.
Obsidian (Volcanic Glass) & Hematite