|
USA | |
| Eckhard D. Stuart collected 9/12/15 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Mark R. Stanton (2000) The Role of Weathering in Trace Metal Distributions in Subsurface Samples from the Mayday Mine Dump nearSilverton, Colorado. Proceedings from the Fifth International Conference on Acid Rock Drainage published by the Society for Mining, Metallurgy, and Exploration Inc., Littleton, Colorado. pp1501-1509 |
| Econ Geol (1991) 86:768-779 |
| Rocks & Minerals 71:2 pp94-101 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Dana 6: 1091. |