Chalcedony from selected localities.
USA | |
| Ref.: Keith, Stanton B. (1973), Arizona Bureau of Geology & Mineral Technology, Geol. Sur. Branch Bull. 187, Index of Mining Properties in Cochise Co., AZ: 56 (Table 4); |
| Rolf Luetcke |
| P Cristofono collection, 2007 |
Ligier Marble Quarries, Dragoon District, Cochise County, Arizona, USA