Chalcedony from East Park Reservoir, Stonyford, Coast Ranges, Colusa County, California, USA
USA | |
| [var. Agate] Johnson, H. C. 1971 Western Gem Hunters Atlas, 11th Edition: Cy Johnson & son, Susanville, Calif., 95 p. |
USA | |
| [var. Agate] Johnson, H. C. 1971 Western Gem Hunters Atlas, 11th Edition: Cy Johnson & son, Susanville, Calif., 95 p. |