|Rock Class||igneous rock|
|Volcanic (volcanic glass)|
Medium: 3.00-4.00 cm
Large: 4.00-5.00 cm
The Mahogany Obsidian presents brown bands, which are due to the presence of iron oxides. It is also known as " Mahogany Obsidian".
Obsidian, or volcanic glass, is molten lava that has cooled rapidly. Its composition is mainly of silicic oxides, being very similar to that of granite or rhyolite.
The piece you receive may differ slightly from the photo shown as the rocks are natural and no piece is identical. The size is approximate.