Pyrite from Freeland-Lamartine Mining District, Clear Creek County, Colorado, USA
USA | |
| U.S. Geological Survey Bulletin 1032-B |
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. | |
| Harrison & Wells(1955) USGS Trace element investigations reports 295. U.S. Geological Survey Bulletin 1032-B |
USGS Bull 1032B |