Mahogany Obsidian is similar in texture to black obsidian. Mahogany obsidian features a beautiful orange/red in coloring with black spots throughout. It is found in the western USA and Mexico. Your purchase will contain 10lbs of premium (Grade-A) spalls that range from 4-7 inches long and are a great choice for the beginner to expert knapper. Stone shown in the picture is an example of what to expect. Actual pieces may very. Skill Range: Beginner to Expert.