Quartz from selected localities.
Germany | |
| [Chalcedony var: Agate] Weiss, S. (1990) Mineralfundstellen Atlas, Deutschland West. Weise Verlag, München, 320 pages. |
[Chalcedony var: Agate] O'Donoghue, M., ed. (1977): The Encyclopedia of Minerals and Gemstones. Rigby (Adelaide), 304 pp. |
Teufelsrutsch, Nack, Alzey-Land, Alzey-Worms, Rhineland-Palatinate, Germany