Sphalerite from Spruce Pine Mining District, North Carolina, USA
USA | |
| Lesure, Frank Gardner (1968) Mica deposits of the Blue Ridge in North Carolina. Professional Paper 577. US Geological Survey doi:10.3133/pp577 |
| Rocks & Min.: 60:92. |
| "Mineralogy and History of the Ray Mica Mine, Yancey County, NC" |