Fluorite from Brown Derby Mine, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
USA | |
| Hanley, J.B., Heinrich, E.W., Page, L.R. (1950) Pegmatite investigations in Colorado, Wyoming, and Utah, 1942-1944. Professional Paper 227. US Geological Survey doi:10.3133/pp227 Bull. Minéral. , 1984, 107, pp. 369-384. Am Min 50:96-104 |
Bob Cobban USGS Proffesional Paper 265 |