Chalcedony from San Juan County, Utah, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Rick Dalrymple Collection |
| Collected by Sebastian Tauber in December 2108. |
www.paleoelegance.com (n.d.) http://www.paleoelegance.com/agatized-dinosaur-bone-and-coprolites | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| USGS: Geological Survey Circular 217 USGS TEI #514 |
Blue Crystal Mine, Lisbon Valley Mining District, San Juan County, Utah, USA