Dumortierite from Jefferson County, Montana, USA
USA | |
| Jay Ellis Ransom,1974, Gems and Minerals of America |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
USA | |
| Jay Ellis Ransom,1974, Gems and Minerals of America |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |