Malachite from Pitkin County, Colorado, USA
USA | |
| 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. Spurr (1898) Geology of the Aspen Mining District, Colorado. USGS Monograph No. 31 | |
U.S. Geological Survey Professional Paper 1073 | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |