Plume Agate from San Juan Mountains, USA
USA | |
| Dorothy M. Schlegal (1957) Gem Stones of the United States : USGS Bulletin 1042-G |
| Rocks & Minerals (July, 2002) |
USA | |
| Dorothy M. Schlegal (1957) Gem Stones of the United States : USGS Bulletin 1042-G |
| Rocks & Minerals (July, 2002) |