|
USA | |
| [Chalcedony var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Barb, C. F. (1958) Some Colorado gem trails, Part 2: The Mineralogist, v. 26, no. 9, p. 198-201. |
| Maneotis:2009 |
| [Chalcedony var. Agate] Rocks and Minerals, Simon & Schuster 1978 |
| [Chalcedony] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
- Douglas Mountain Mining District
| [Chalcedony var. Agate] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
- Fourmile Mining District (Timberlake Creek Mining District)
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Matthew Crystalman |
| Colorado School of Mines |
Unnamed Copper Prospect, Cross Mountain Area, Moffat County, Colorado, USA