Magnetite from Big Blackfoot Mining District (Helmville Mining District), Powell County, Montana, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. | |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. | |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. | |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. |