Martite from San Juan Mountains, USA
USA | |
| Larsen, E.S. (1942) Alkalic rocks of Iron Hill, Gunnison County, Colorado. Shorter contributions to general geology, 1941-42. United States Geological Survey Professional Paper 197-A. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |