Uraninite from Black King Mine (Black King No. 4; Black King No. 5; Black King No. 5 Claim; Unpatented Claims: Black King No. 1; Evans Claims; Weatherly Claims), Placerville Mining District, Lower San Miguel Mining District, San Miguel County, Colorado, USA
USA | |
| [var. Pitchblende] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |