Opal from Languiñeo Department, Chubut Province, Argentina
Argentina | |
| ARAGON, E. et al. Petrogenesis of thundereggs in Eocene rhyolite domes of central Chubut, Patagonia. Rev. Asoc. Geol. Argent. [online]. 2006, vol.61, n.3, pp. 347-354. |
Padrón de Minas de la Provincia de Chubut (2005). |