Helvine from selected localities.
USA | |
| Rocks & Min.: 16: 244.; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. |
Rocks & Min.: 16: 244, 247. | |
Rocks & Min.: 16: 244.; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Peter Dunn (1976) Genthelvite and the helvine group. Mineralogical Magazine, 40:627-636 | |
U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia. | |
Rocks & Min.: 16: 244.; Peter Dunn (1976) Genthelvite and the helvine group. Mineralogical Magazine, 4O:627-636 |
Moulton Mine, Walkerville, Butte Mining District, Silver Bow County, Montana, USA