Description: Government Mountain obsidian comes from the slopes of Government Mountain in the San Francisco Volcano Field near Flagstaff, Arizona. The material is fine-grained and generally lacking phenocrysts, but appears granular because of the presence of alkali feldspar in the matrix.
- Author
- Michael Terlep/William Bryce, Northern Arizona University Anthropology Laboratories
- File
- governmentmtobsidian.jpg
- File size
- 215 KB