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Colombia | |
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| (2002) Emeralds of the World. extraLapis English 2. Lapis International LLC
Gübelin, E. and Wolgensinger, M. (1976) Edelstenen. Uitgeverij Artis, Brussel (in Dutch). |
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| (2002) Emeralds of the World. extraLapis English 2. Lapis International LLC |
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| Manuela Zeug, Andrés Ignacio, Rodríguez Vargas, Lutz Nasdala (2017): Spectroscopic study of inclusions in gem corundum from Mercaderes, Cauca, Colombia. Physics and Chemistry of Minerals 44, 221-233. |
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| Andres Felipe Gonzalez Duran |
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| Castellanos-Alarcón, O. M., Ríos-Reyes, C. A., & Mantilla-Figueroa, L. C. (2016). Occurrence of a skarn-type mineralogy found in Ciénaga Marbles, located in the NW foothills of the Santa Marta Massif (Colombia). Dyna, 83(196), 69-79. |
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| Econ Geol (1984) 79:106-123 |
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Ecuador | |
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| Gumowska-Wdowiak Z., Manecki A., Narębski W., Paulo A. 1974: Mineralogical and chemical study of dacite from Quilotoa volcano in Ecuador. Mineralogia Polonica, vol. 5, 3-20 |
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Netherlands | |
- Sinterklaas Bay (Sint Nicolaas Bay)
| Färber, Gunnar (n.d.) Personal Communication, Gunnar Färber Mineralien. |
La Marina Mine, Pauna, Western Boyacá Province, Boyacá Department, Colombia