Natural Crushed Black Obsidian for Stone Inlay, Medium, 1/2 ounce 1/2 Ounce of 100% NATURAL Black Obsidian - NOT Synthetic or Treated Medium to Fine: Size ranges from 2 millimeters and 0.25 millimeters Great inlay material for voids in woodworking projects Obsidian from New Mexico, United States Host rock has been removed by hand to ensure superior quality