Rhyolite from Colorado Plateau, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Anthony, John W., Williams, Sidney A., Bideaux, Richard A., Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.) University of Arizona Press, Tucson, AZ. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Jones, E.L., Jr. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bulletin 710-D: 158. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |