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Czech Republic | |
| www.geocities.com/Smula.geo |
| [Opal-A var. Opal-AN] |
| Paulis, P., Hruzek, L., Janecek, O., Dvoral, Z., Toman,J., Svejkovsky,J., Radon, M. (2014) The most interesting mineralogical localities of Bohemia - Zeolites and accompanying mineralisation. Part 1 and 2. 144 and 280 pp. Kutná Hora (in Czech) ISBN 978-80-86406-79-4 |
| [Opal-A var. Opal-AN] Radoň M. Významné mineralogické lokality Českého středohoří. Minerál 2009, XVII(2):106-126. |
| [Opal-AN var. Hyalite] P.Pauliš |
| Ulrych, J. et al. (2000): Tertiary phonolite laccolith of Mariánská hora hill, N. Bohemia: geological, petrological and mineralogical characteristics. Acta Montana IRSM AS CR, series A No. 15 (116), p. 5-44. |
| [Opal-A var. Opal-AN] |
Radešín hill, Radešín, Chuderov, Ústí nad Labem District, Ústí nad Labem Region, Czech Republic