Pyrrhotite from Beaverhead County, Montana, USA
USA | |
| www.lrream.com (2004) http://www.lrream.com/montanaskarns.html |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Winchell, Alexander Newton (1914) Mining districts of the Dillon quadrangle, Montana, and adjacent areas. Bulletin Vol. 574. US Geological Survey doi:10.3133/b574 |