Quartz from
Mexico | |
| [var. Chalcedony] Sotelo, C. M. (2016). Geology and mineralization controls surrounding the Palmarejo mining district-A compilation of remote and hands on exploration techniques. The University of Texas at El Paso. |
| [var. Chalcedony] Paul L. Broughton (1968) Peanut Obsidian From Sonora, Mexico. The Journal of Gemology, Vol. 11, No. 1 |
| Panczner (1987): 181 & 262. | |
| Richard Dale Collection | |
| Panczner (1987): 149-346. | |
| Espinosa Perea, V. J. (1999). Magmatic evolution and geochemistry of the Piedras Verdes deposit, Sonora, Mexico. MS thesis University of Arizona |
| Panczner (1987): 166-364. |
| King, Van (n.d.) Personal communcation. |
Álamos, Álamos Municipality, Sonora, Mexico