Opal from North Andes plate
Colombia | |
| [Opal-A var. Opal-AN] (2002) Emeralds of the World. extraLapis English 2. Lapis International LLC |
Ecuador | |
| Ordoñez, Marta (2006): MICROPALEONTOLOGÍA ECUATORIANA. CIGG: PETROPRODUCCION. p : 85,86. |
Colombia | |
| [Opal-A var. Opal-AN] (2002) Emeralds of the World. extraLapis English 2. Lapis International LLC |
Ecuador | |
| Ordoñez, Marta (2006): MICROPALEONTOLOGÍA ECUATORIANA. CIGG: PETROPRODUCCION. p : 85,86. |