Opal from Sierra Madre de Chiapas, Central America
Honduras | |
| [Precious Opal var. Black Opal] Wayne Osborne Collection |
| Sinkankas, John (1976) Gemstones of North America Vol. 2. Van Nostrand Reinhold Company, New York. |
| Sinkankas, John (1976) Gemstones of North America Vol. 2. Van Nostrand Reinhold Company, New York. |
Tablon Mine, Erandique, Lempira Department, Honduras