|
UK | |
| Norman Wilson collection. |
| Bridges TF and Young BY. Supergene minerals of the Northern Pennine Orefield-A Review. Journal of the Russell Society 7(1), 3-14(1998) |
| Norman Wilson personal collection |
| Green, David I., McCallum, David, Wood, Mike (2000) Famous Mineral Localities: The Brownley Hill Mine, Alston Moor District, Cumbria, England. The Mineralogical Record, 31 (3) 231-250 |
| |
| Richard de Nul collection |
Smallcleugh Mine, Nenthead, Alston Moor, Eden, Cumbria, England, UK